[EE] User can keep their commit email private

See merge request gitlab-org/gitlab-ee!8102

[Geo] Add instructions to remove tracking database after promotion

See merge request gitlab-org/gitlab-ee!8143

EE port: Enhance performance of counting local Uploads

Closes #6070

See merge request gitlab-org/gitlab-ee!8144

Remove code owner from approver suggestion

Closes #1012

See merge request gitlab-org/gitlab-ee!8142

The private commit email is automatically generated in the format:
id-username@noreply.HOSTNAME

GitLab instance admins are able to change the HOSTNAME portion,
that defaults to Gitlab's hostname, to whatever they prefer.

Changes push rulels to accept private commit emails

Logical replication is not supported for Geo

Closes #8048

See merge request gitlab-org/gitlab-ee!8132

As this is automatically done in !7933

Assign approvers based on code owners

Closes #1012

See merge request gitlab-org/gitlab-ee!7933

EE Resolve "`parallel` job keyword MVC"

See merge request gitlab-org/gitlab-ee!8119

Add an index to the `store` column on `uploads`. This makes counting
local uploads faster.

Also, there is no longer need to check for objects with `store = NULL`.
See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557

---

### Query plans

Query:

```sql
SELECT COUNT(*)
FROM "uploads"
WHERE ("uploads"."store" = ? OR "uploads"."store" IS NULL)
```

#### Without index

```
gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                  QUERY PLAN
---------------------------------------------------------------------------------------------------------------
 Seq Scan on uploads  (cost=0.00..601729.54 rows=578 width=272) (actual time=6.170..2308.256 rows=545 loops=1)
   Filter: ((store = 1) OR (store IS NULL))
   Rows Removed by Filter: 4411957
 Planning time: 38.652 ms
 Execution time: 2308.454 ms
(5 rows)
```

#### Add index

```
gitlabhq_production=# create index uploads_tmp1 on uploads (store);
CREATE INDEX
```

#### With index

```
gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                          QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------
 Bitmap Heap Scan on uploads  (cost=11.46..1238.88 rows=574 width=272) (actual time=0.155..0.577 rows=545 loops=1)
   Recheck Cond: ((store = 1) OR (store IS NULL))
   Heap Blocks: exact=217
   ->  BitmapOr  (cost=11.46..11.46 rows=574 width=0) (actual time=0.116..0.116 rows=0 loops=1)
         ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..8.74 rows=574 width=0) (actual time=0.095..0.095 rows=545 loops=1)
               Index Cond: (store = 1)
         ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..2.44 rows=1 width=0) (actual time=0.020..0.020 rows=0 loops=1)
               Index Cond: (store IS NULL)
 Planning time: 0.274 ms
 Execution time: 0.637 ms
(10 rows)
```

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6070

Remove gitlab-ui loading icon from global (EE)

See merge request gitlab-org/gitlab-ee!8170

EE port of mr-image-commenting

See merge request gitlab-org/gitlab-ee!8254

Merge branch 'ee-52771-ldap-users-can-t-choose-private-or-internal-when-creating-a-new-group' into 'master'

Fix new group visibility form for non-admins

See merge request gitlab-org/gitlab-ee!8263

Support epics autocomplete for project objects

Closes #7472

See merge request gitlab-org/gitlab-ee!8180

Removes an owner permission check before rendering the visibility
select radio inputs as non-admins will not have permission.

Ensures all users creating a group can select its visibility.

Set @push early for EE

In EE, there is need to call `merge_requests_for_source_branch`
before calling CE's `refresh_merge_requests,
in order to obtain the old diffs.

However that requires `@push`,
initialized inside CE's refresh_merge_requests.

However it can't be set early in EE, or static analysis would fail
because use of instance variables in module is discouraged.
So @push is set in execute instead.

Its return type is change from `Approver` to `User`,
as code owner is type `User`, and it does not make sense
to wrap them in `Approver`.

When approvers are overriden, code owner is not included,
because the persisted approvers will include code owners already.

Add endpoint to delete approver by user_id,
since overall_approvers now returns User,
and this avoids one query for fetching user's approver association.

Fetch database columns directly if available

Suitable for testing old and new paths involved for each file in diff

Docs: add notes on group SSO user management

See merge request gitlab-org/gitlab-ee!8260

Geo - Redirect user back to the secondary after a logout & re-login via the primary

Closes #4459

See merge request gitlab-org/gitlab-ee!8157

Update link to code quality docs

See merge request gitlab-org/gitlab-ee!8221

In Ruby 2.4, `URI.join("http://test//", "a").to_s` will
remove the double slash, however it's not the case in
Ruby 2.5. Using chomp should work better for the intention,
as we're not trying to allow things like ../ or / paths
resolution.

This helper method append path to host, making sure
there's one single slash as path separator.

Send notifications for epic status change

Closes #7272

See merge request gitlab-org/gitlab-ee!8247

Geo: Improve read-only message in secondary nodes for actionable screens

Closes #8124

See merge request gitlab-org/gitlab-ee!8238

Docs outline scaling options

See merge request gitlab-org/gitlab-ee!7824