Enables frozen string in the following:

* ee/lib/gitlab/**/*.rb
* ee/lib/omni_auth/**/*.rb
* ee/lib/pseudonymizer/**/*.rb
* ee/lib/system_check/**/*.rb

Partially addresses https://gitlab.com/gitlab-org/gitlab-ce/issues/47424.

Add autocomplete for issues and MRs in epics

Closes #5606

See merge request gitlab-org/gitlab-ee!8936

Fix bad merge on integrations docs

See merge request gitlab-org/gitlab-ee!9066

Add feature flag for container scanning parsing

See merge request gitlab-org/gitlab-ee!9063

Mock error_tracking_setting to fix tests on failing master

See merge request gitlab-org/gitlab-ee!9062

Link highlighting of jon.doe@example.com swallowed the trailing backtick, destroying formatting.

See merge request gitlab-org/gitlab-ce!24133

Document new incoming email address format

See merge request gitlab-org/gitlab-ce!23991

Merge branch 'ee-29951-support-new-issue-creation-by-email-without-subaddressing-docs' into 'master'

Document new incoming email address format (EE)

See merge request gitlab-org/gitlab-ee!9013

Hashed Storage: Only set as `read_only` when starting the per-project migration

See merge request gitlab-org/gitlab-ce!24128

Fix doc for "Allow getting the merge base of multiple revisions"

See merge request gitlab-org/gitlab-ce!24051

Add doc for removing Geo node

See merge request gitlab-org/gitlab-ee!8868

This appears to add "Error Tracking" and remove duplicate
"quick actions" and "register" entries.

EE port of 49231-import-issues-csv

See merge request gitlab-org/gitlab-ee!8785

Import issues from CSV

Closes #49231

See merge request gitlab-org/gitlab-ce!23532

References with namespace are inserted because this is at group scope
and iids are not unique

In the previous code, we locked the project during the migration
scheduling step, which works fine for small setups, but can be
problematic in really big installations.

We now moved the logic to inside the worker, so we minimize the time a
project will be read-only. We also make sure we only do that if
reference counter is `0` (no current operation is in progress).

Skip parsing of container scanning report if feature flag is disabled.

Fix QA spec sharing project in the wrong context

Closes gitlab-org/quality/nightly#54

See merge request gitlab-org/gitlab-ce!24183

Docfix/broken autodevops links

Closes #9078

See merge request gitlab-org/gitlab-ee!9058

Remove duplicate feature text and make linting fixes

Closes #8936

See merge request gitlab-org/gitlab-ee!9002

Externalize strings from `/app/views/shared/notes`

See merge request gitlab-org/gitlab-ce!23696

Externalize strings from `/app/views/shared/notes`

See merge request gitlab-org/gitlab-ee!9039

Add search field to issue board switcher

Closes #7715

See merge request gitlab-org/gitlab-ee!8862