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

Puts back trailing whitespace

Changes after review

Changes after review

Adds Changelog entry

Follow documentation styleguide

Resolve "Cannot login with 2fa"

Closes #27047

See merge request !8730

Don't group issue, merge request and TODO lists by project

Closes #23634

See merge request !8519

add information that docker registry storage needs to be accessible for docker clients

See merge request !8179

Added test for initial merge request widget state

See merge request !8738

Changed composer installer script in the CI PHP example doc

See merge request !8817

Ensure autogenerated title does not cause failing spec

Closes #26933

See merge request !8693

UX Guide: minor updates

See merge request !8862

[ci skip] UX guide: clean up term tables in copy

[ci skip] UX guide: update dropdown max height for multiline items

Remove hard-coded absolute URLs from all frontend assets

See merge request !8831

Fixed Issuable sidebar so it remains closed on mobile/smaller screen devices

See merge request !7466