[EE] Greatly reduce test duration for git_access_spec

See merge request !2719

fix Modify commit message button spacing

Closes #3163

See merge request !2693

Fixes Audit Events Documentation issue link

See merge request !2725

Refactor GPG docs

See merge request !2724

Fix url for object store artifacts

Closes #3172

See merge request !2705

1. Generating a GPG key
1. Signing commits
1. Associating a GPG key with Git

- Reduces duplication of long ref strings
- Passes push rule attributes directly to `create_push_rule`, rather
  than creating one and then updating it.

Due to a logic error, these specs weren't actually doing anything -- we
were running the checks on `Hash.new(Hash.new(false))`, which is just
`{}`.

Make issuable filter dropdown style consistent

See merge request !2711

This uses the same thinking as the earlier `run_permission_checks`
refactor, to run all of the checks for the matrix in a single `it` block
to avoid repeated setup.

- Adds a new `ProjectMovedError` class to encapsulate that error
  condition. Inherits from `NotFoundError` so existing rescues should
  continue to work.
- Separating that condition out of `NotFoundError` allowed us to
  simplify the `raise_not_found` helper and avoid repeating the literal
  string.
- Spec makes use of `ERROR_MESSAGES` hash to avoid repeating literal
  error message strings.

- Combine multiple `it` blocks into one where it made sense
- Use `set` for the top-level User record
- Refactor permission matrix tests

Resolve "Export issue time tracking information"

Closes #1406

See merge request !2627

Document how to use AWS IAM profiles for object storage

See merge request !2708

Tuesday: CE upstream

Closes #3178, #2750, gitaly#404, and gitlab-ce#27390

See merge request !2683

[ci skip]

Move workflow/importing/ to user/project/import/

See merge request !2694

Fixed issue boards focus mode not being visible to guest users

Closes #3182

See merge request !2699

Fix LDAP backwards compatibility

Closes gitlab-ce#36432 and #3082

See merge request !2690

Closes #3182

Fix pipeline quota text not collapsing in the new sidebar

See merge request !2697

Create system notes only if issue was successfully related to another

Closes gitlab-ce#36443

See merge request !2684

Repo editor with flex layout -- EE merge edition

See merge request !2700

Improves handling of the mirror threshold

Closes #3134

See merge request !2671