(Removes opts destructuring and inheritance boilerplate)

Skipped jobs should be considered successful

## What does this MR do?

If all jobs in previous stage are all skipped, the next stage should consider previous stage succeeded.

## Why was this MR needed?

Since for now we consider all manual jobs if skipped, should not block the next stage from running.

Closes #22598 

See also #20342 (because this merge request conflicts with it)

See merge request !6604

Fix small typo in using_docker_images.md, file is called `build_script` (using underscore)

## What does this MR do?

This MR fixes a very small typo in the using_docker_images.md documentation, a space was used in the filename `build_script` while it should be an underscore. Not sure of a MR is the best way to get this changed, trying it anyway :).

## Moving docs to a new location?

No

See merge request !6682

Remove lease from Event#reset_project_activity

## What does this MR do?

This removes the exclusive lease used by `Event#reset_project_activity` in favour of conditional UPDATE queries. See dbcc623a901cb3fb725976217416bafad73dbf69 for more information.

## Why was this MR needed?

Obtaining the lease can, for whatever reason, be _really_ slow. See https://gitlab.com/gitlab-org/gitlab-ce/issues/22473 for more information.

https://gitlab.com/gitlab-org/gitlab-ce/issues/22473

See merge request !6678

Update housekeeping docs for new GitLab UI.

I spent far too much time trying to find this button.

See merge request !6679

Fix project deletion when feature visibility is set to private

Projects that are destroyed are put in the pending_delete state.
The ProjectDestroyWorker checks whether the current user has
access, but since the ProjectFeature class uses the default scope
of the Project, it will not be able to find the right project.

This was a regression in 8.12 that caused the following stack trace:

```
NoMethodError: undefined method `team' for nil:NilClass
  from app/models/project_feature.rb:62:in `get_permission'
  from app/models/project_feature.rb:34:in `feature_available?'
  from app/models/project.rb:21:in `feature_available?'
  from app/policies/project_policy.rb:170:in `disabled_features!'
  from app/policies/project_policy.rb:29:in `rules'
  from app/policies/base_policy.rb:82:in `block in abilities'
  from app/policies/base_policy.rb:113:in `collect_rules'
  from app/policies/base_policy.rb:82:in `abilities'
  from app/policies/base_policy.rb:50:in `abilities'
  from app/models/ability.rb:64:in `uncached_allowed'
  from app/models/ability.rb:58:in `allowed'
  from app/models/ability.rb:49:in `allowed?'
  from app/services/base_service.rb:11:in `can?'
  from lib/gitlab/metrics/instrumentation.rb:155:in `block in can?'
  from lib/gitlab/metrics/method_call.rb:23:in `measure'
  from lib/gitlab/metrics/instrumentation.rb:155:in `can?'
  from app/services/projects/destroy_service.rb:18:in `execute'
```

Closes #22948

See merge request !6688

Projects that are destroyed are put in the pending_delete state.
The ProjectDestroyWorker checks whether the current user has
access, but since the ProjectFeature class uses the default scope
of the Project, it will not be able to find the right project.

This was a regression in 8.12 that caused the following stack trace:

```
NoMethodError: undefined method `team' for nil:NilClass
  from app/models/project_feature.rb:62:in `get_permission'
  from app/models/project_feature.rb:34:in `feature_available?'
  from app/models/project.rb:21:in `feature_available?'
  from app/policies/project_policy.rb:170:in `disabled_features!'
  from app/policies/project_policy.rb:29:in `rules'
  from app/policies/base_policy.rb:82:in `block in abilities'
  from app/policies/base_policy.rb:113:in `collect_rules'
  from app/policies/base_policy.rb:82:in `abilities'
  from app/policies/base_policy.rb:50:in `abilities'
  from app/models/ability.rb:64:in `uncached_allowed'
  from app/models/ability.rb:58:in `allowed'
  from app/models/ability.rb:49:in `allowed?'
  from app/services/base_service.rb:11:in `can?'
  from lib/gitlab/metrics/instrumentation.rb:155:in `block in can?'
  from lib/gitlab/metrics/method_call.rb:23:in `measure'
  from lib/gitlab/metrics/instrumentation.rb:155:in `can?'
  from app/services/projects/destroy_service.rb:18:in `execute'
```

Closes #22948

Fix todos page mobile viewport layout

## What does this MR do?
Fixes the todos page mobile viewport layout

## Are there points in the code the reviewer needs to double check?
Shouldn't be any 👍 

## Why was this MR needed?
Improve GitLab usability on mobile devices

## Screenshots (if relevant)
Before:
![Simulator_Screen_Shot_Sep_13__2016__11.30.19_AM](/uploads/7053a1bb1fca6238c5f86d671bf96ff0/Simulator_Screen_Shot_Sep_13__2016__11.30.19_AM.png)

After:
![Simulator_Screen_Shot_Sep_13__2016__11.30.04_AM](/uploads/a30921c1a1118655b547977872e8e1c7/Simulator_Screen_Shot_Sep_13__2016__11.30.04_AM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #22097

See merge request !6325

Per GitLab.com's performance metrics this method could take up to 5
seconds of wall time to complete, while only taking 1-2 milliseconds of
CPU time. Removing the Redis lease in favour of conditional updates
allows us to work around this.

A slight drawback is that this allows for multiple threads/processes to
try and update the same row. However, only a single thread/process will
ever win since the UPDATE query uses a WHERE condition to only update
rows that were not updated in the last hour.

Fixes gitlab-org/gitlab-ce#22473