Fix indentation for let

To better diagnose the flaky behavior of
sidebar_spec.rb in CI,

We are splitting off the parts of the spec
into separate files.

This MR also:
- renames the spec description to clearly
indicate the subject tested is
the sidebar in project issue boards

- replaces let! with let_it_be where
appropriate

Add artifact expiration info to test coverage viz docs

See merge request gitlab-org/gitlab!56881

More edits for style

See merge request gitlab-org/gitlab!57034

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/300312

Fixed rubocop offense Layout/RescueEnsureAlignment

See merge request gitlab-org/gitlab!56870

Make group runner CI builds use distinct CTE optimzation [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!57045

Deduplicate SAML docs information

See merge request gitlab-org/gitlab!56595

Resolve "Traversal IDs column sync" [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!52854

Update admin troubleshooting page

See merge request gitlab-org/gitlab!50535

Add troubleshooting tip for pages 404 to admin docs

See merge request gitlab-org/gitlab!56372

Remove controller, actions, and job class fields from Marginalia

See merge request gitlab-org/gitlab!55854

docs: Fix typo in JavaScript style guide

See merge request gitlab-org/gitlab!57022

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Asyncronously import monaco components

See merge request gitlab-org/gitlab!56909

Docs: Add max number of feature flags for all types

See merge request gitlab-org/gitlab!56833

Create new unit test tables

See merge request gitlab-org/gitlab!56137

Add Username to Email From Header in Notifications

See merge request gitlab-org/gitlab!56588

When replying to a notification from GitLab, it can be non-obvious as
to how to ping the person I am responding to without looking for their
username in Gitlab.

By adding the username to the From header in the form of From: User
Name (@user), it is much more clear as to how to ping a person in the
response.

Move from btn-success to btn-confirm in projects/tags directory

See merge request gitlab-org/gitlab!56940

Update occurrences of node to site

See merge request gitlab-org/gitlab!56280

`TodosDestroyer::EntityLeaveWorker` generates expensive SQL queries

See merge request gitlab-org/gitlab!56995

Since the group is private, and we're only looking at it's
descendants, we don't need to consider public/internal groups

Password reset improvements

See merge request gitlab-org/gitlab!56992

Use --local for setting bundle config

See merge request gitlab-org/gitlab!56983

Fix baseurl wordage typo

See merge request gitlab-org/gitlab!55722

Turn on feature flag for the code review aggregated metrics

See merge request gitlab-org/gitlab!56734

Move from btn-success to btn-confirm in registrations directory

See merge request gitlab-org/gitlab!56944

Add recaptcha to group creation [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!56707

Localize assignees and reviewers label

See merge request gitlab-org/gitlab!56473