From `enc_settings_key_base` to `encrypted_settings_key_base`

This adds:

- Path for storing encrypted settings in config
- optional base token generation
- Additional error handling for missing config and keys

- Generates a new key or correct length pased on the provided base key
- Updates the naming of the key param passed to EncryptedConfiguration
- Adds tests for key length to the spec tests

Increase cipher to 256

The 128 was the default from upstream configuration encryption but
is lower then the message encryptor default. Not sure why, so we
might as well go with the larger one.

- Adds support for a new (optional) secret key from secrets.yml
- Adds a encrypted configuration class than can decrypt/encrypt files
  using the provided key
- Adds a new encrypted setting helper method to Settings for the new
  secret key

Allow Pages to define a storage-specific connection

See merge request gitlab-org/gitlab!48098

Update issues in ES when project visibility settings change

See merge request gitlab-org/gitlab!47007

Ensure changes to project visibility settings also update the associated
issue documents for that project. This is required to keep the issue
documents updated once the visibility permissions are stored within
the issue document in preparation for global search joins being
removed from the Elasticsearch issue query.

Quarantine user_comments_on_diff_spec due to flakiness

See merge request gitlab-org/gitlab!48199

Re-name Instance Statistics as Usage Trends

See merge request gitlab-org/gitlab!48183

This re-names the Instance Statistics feature as Usage Trends in the
UI (not in the code itself).

Use stricter typed global IDs for iterations

See merge request gitlab-org/gitlab!47045

Also accept a global id when querying the `iterations`
field

But maintain backward compatibility by accpeting
a raw model id

Update Shared Runners docs to reflect decrease in free CI/CD minutes

See merge request gitlab-org/gitlab!46587

Add confirm modal to unblock user

See merge request gitlab-org/gitlab!47442

BulkImports: Import Group Epics

See merge request gitlab-org/gitlab!46710

Migrate tooltip_on_truncate_spec.js to Jest

See merge request gitlab-org/gitlab!47582

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/47582

Add test reports to usage ping

See merge request gitlab-org/gitlab!47809

Expose creation/update times for issue links

See merge request gitlab-org/gitlab!48051

Remove suggest_pipeline feature flag

See merge request gitlab-org/gitlab!48140

Add basic feature spec for Balsamiq viewer

See merge request gitlab-org/gitlab!47725

Create onboarding namespace action table

See merge request gitlab-org/gitlab!48018

Remove yet MORE future tense from unowned docs

See merge request gitlab-org/gitlab!48176

These unowned docs need future tense scrubbed out of them too!

Stub file reads only for the files we are interested in

See merge request gitlab-org/gitlab!48014

Refactor GlMentions autocomplete component

See merge request gitlab-org/gitlab!47438

Refactor GlMentions to ready it for adding Epics autocomplete
which is EE

Update dependency @gitlab/ui to v23.12.0

See merge request gitlab-org/gitlab!47921

More future-tense fixes for unowned pages

See merge request gitlab-org/gitlab!48175

Shift from future tense to present tense.

Example of `uid` should indicate a single value

See merge request gitlab-org/gitlab!48096

Replace Value Stream Management with Optimize

See merge request gitlab-org/gitlab!48169

Fix future-tense issues in unassigned pages

See merge request gitlab-org/gitlab!48170

Remove unused popover directive in Geo node item

See merge request gitlab-org/gitlab!48146

These pages don't have owners, but still need instances of future
tense scrubbed out.

UI for uploads counting as storage

See merge request gitlab-org/gitlab!47113

Add the ability to import Group epics with the Group Migration
(BulkImports) feature.