Fix inconsistent return type

Closes #27150

See merge request !8290

Refactor MergeRequest::BuildService

Closes #24795

See merge request !8462

Services changed to Integrations

See merge request !8686

Remove flash warning from login page

See merge request !8864

Ensure rake is called within the correct bundle context

See merge request !8882

Expose pipelines API for commits and merge requests

See merge request !8837

add changelog entry

replace local variables `merge_request` with instance ones

modify `MergeRequests::BuildService` to fix failed tests

extract `assign_target_project` method

remove unnecessary instance variables

remove exclamation marks and rewrite conditionals to improve readability

extract `params_does_not_contain_branches?` method, rename `unprepared_merge_request` method to `uncreatable_merge_request`

replace instance variables `merge_request` and `error_messages` with getters and setters; divide `set_title_and_description` method on two separate ones

refactor `execute` method

return `set_title_and_description` method

rename `branches_selected?` method to `branches_present?` to make it more different from `branches_specified?`

fixes after discussion

renamed method branches_valid?

fix space

return assigning methods into `execute` method

simplify `find_target_branch` and `find_source_project` methods

fix spec `merge request issuable record that supports slash commands in its description and notes`

Add project ID index to `project_authorizations` table to optimize queries

Closes #27443

See merge request !8890

Resolve "ba-resize memory leak"

Closes #26282

See merge request !8412

As described in #27443, the `project_authorizations` table is often used to retrieve
all team members of this project. This can lead to a number of slow queries impacting
load times. This MR adds an index for just `project_id`.

Closes #27443

Resets issue boards assignee dropdown

Closes #26514 and #26814

See merge request !8540

Move todos empty state icons

See merge request !7370

Fix build access policies when pipelines are public

See merge request !8711

Fix 8.16.0 release date.

See merge request !8881

Labels empty state

Closes #24457 and #20852

See merge request !7443

Nested groups improvements pt 2

See merge request !8827

It was already released, we do not have to wait until February!

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Ignore encrypted attributes in Import/Export

Closes #24458

See merge request !8739

Fixed delete labels not working

Review changes

Improve performance of triggered chat commands

See merge request !8876

When the trigger endpoint is called, it has to find the right service
for the given project. However, the old implementation did much more.

For example, it build a list of the missing services on this project.
This whole process took about 750ms _each time_. The current
implementation is expected to perform 10x better, as it only searches in
the current projects services. Given the service has to be configured
anyway, this can be done.

Document how to vue

See merge request !8866

* Regenerates tokens for all models that have them
* Remove variables, since they are basically just storing encrypted data
* Bumped version up to 0.1.6
* Updated related docs

Fix the documentation to use the correct variable in a code example

See merge request !8585