Closes #42800.

See https://gitlab.com/gitlab-org/gitlab-ce/issues/43198

Constructors shouldn't throw exceptions. We also learned that
different LDAP servers behave a bit unexpectedly sometimes -
returning attributes we didn't ask for, or returned attributes
with language subtypes.

Closes #26466.

This reverts commit a58f8c32, reversing
changes made to cd5d75c3.

Fix using wildcards in protected tags to expose protected variables

James Lopez authored 7 years ago and Robert Speicher committed 7 years ago

[10.4] Fix GH namespace security issue

Restrict Todo API mark_as_done endpoint to the user's todos only

[10.4] Fix stored XSS in code blocks

Adds CSS for child envrionments

Artifacts are in the middle of being migrated from ci_builds to
ci_job_artifacts. The expiration date is currently visible in both of
these tables and the test for whether an expired artifact is present
for a job is complex as it requires checking both the of the tables.

Add two new indexes, one on ci_builds.artifacts_expire_at and one on
ci_job_artifacts.expire_at to enable finding expired artifacts
efficiently.

And until the migration is finished, replace the SQL for finding
expired and non-expired artifacts with a hand-crafted UNION ALL based
query instead of using OR. This overcomes a database optimizer
limitation that prevents it from using these indexes.

When the migration is finished the next version should remove this
query and replace it with a much simpler query on just
ci_job_artifacts. See
https://gitlab.com/gitlab-org/gitlab-ce/issues/42561 for followup.

Since populating the fork networks was scheduled multiple times
because of bugs that needed to be fixed:

- https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15595/
  Creating fork networks for projects that were missing the root of
  the fork network.

- https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15709
  The API allowed creating forked_project_links without
  fork_network_members.

Scheduling this migration multiple times would case it to run
concurrently. Which in turn would try to insert the same data into
`fork_network_members` causing duplicate key errors.

This avoids running the migration multiple times.

Closes #40755.