Adding/removal of epic links expects that both parent and child epics
are created. If parent_epic is applied on a new not-persisted epic,
then EpicLink then this epic link is created before target epic is saved
which has couple of side-effects:
* CreateService's set_child_epic fails to update the new epic
* no system notes are created
* internal_id for epics is out-of-sync because EpicLink attempts to
  store new epic (and fails and rolls-back thsi save) -> then
  internal_id is already set which target epic is saved (as part of
  regular save operation) but not bumped in DB

Because epic quick actions don't work properly with unpersisted epics,
it will be disabled until the code is updated to work properly with new
epics.

Also DB migration to reset internal_id is renamed to re-enqueue (and
re-run) it again.

Refactor Git/LFS request specs into shared examples

See merge request gitlab-org/gitlab!49138

This allows us to reuse them in EE.

- The shared examples for `Repositories::GitHttpController` were moved
  without any changes.

- The LFS request specs were cleaned up and simplified a bit.

Use vue test utils in roadmap specs and add helpful comments in roadmap code.

See merge request gitlab-org/gitlab!49433

Whenever certain variables are modified in roadmap.scss,
the changes need to be reflected in roadmap/constants.js

Use `supports_severity?` to check feature availability on issuables

See merge request gitlab-org/gitlab!49378

Fix the (potential) race-condition issue on `IgnorableColumns`

See merge request gitlab-org/gitlab!49163

Ignore missing source project when editing MR

See merge request gitlab-org/gitlab!49311

Add method to create issue in Jira from vulnerability finding

See merge request gitlab-org/gitlab!49000

This change adds link to finding to create issue in Jira.

Add coquality comparison for merge request

See merge request gitlab-org/gitlab!48830

Fix existing_errors for AccessibilityReportsComparer

See merge request gitlab-org/gitlab!49245

This commit fixes how we calculate our existing_errors between
2 accessibility reports. Instead of returning all existing errors
from the base report we are now getting the intersection between
the base and the head report.

Bump validates_hostname to 1.0.11

See merge request gitlab-org/gitlab!49452

Add feature category to API latency histogram

See merge request gitlab-org/gitlab!49232

Remove invite email experiment entry

See merge request gitlab-org/gitlab!49346

ci: Add rules to the 'workhorse' job

See merge request gitlab-org/gitlab!49117

Remove ci_job_line_links feature flag

See merge request gitlab-org/gitlab!49454

Upgrade mock-apollo-client to v0.5.0

See merge request gitlab-org/gitlab!49467

Add a note about manual trigger jobs

See merge request gitlab-org/gitlab!49443

EKS: Provide user feedback on AWS authorization errors

See merge request gitlab-org/gitlab!49278

Geo: Document verification indexes

See merge request gitlab-org/gitlab!49146

Require users to copy, download, or print 2FA recovery codes

See merge request gitlab-org/gitlab!49078

In an effort to encourage users to save recovery codes. Prevent users
from proceeding until they have copied, downloaded, or printed their
2FA recovery codes

Updating database MR guide with requirements

See merge request gitlab-org/gitlab!48523

Use cross pipeline dependencies

See merge request gitlab-org/gitlab!48342

Include actual limit in pipeline errors

See merge request gitlab-org/gitlab!48710

Remove stale and dead code

See merge request gitlab-org/gitlab!49339

- add missing entries
- remove obsolete file

Fix future tense issues

See merge request gitlab-org/gitlab!49449

Allow Group SAML to auto-created new users

See merge request gitlab-org/gitlab!48953

Introduce Add Seats Button on Billing Page

See merge request gitlab-org/gitlab!49242

Signed-off-by: Angelo Gulina <agulina@gitlab.com>

Remove cd_auto_rollback feature flag

See merge request gitlab-org/gitlab!49098

Enable Crowd auth for git-over-https

See merge request gitlab-org/gitlab!46935

These changes enable git authentication via Crowd for git requests using
https. This is similar to the existing LDAP authenticator. There are
also changes to the User model to prevent the password warning message
from showing if Crowd is enabled.