* master: (109 commits)
  Remove Filesystem check metrics that use too much CPU to handle requests
  Set merge_request_diff_id on MR when creating
  Add a column linking an MR to its diff
  Remove useless closeReopenReport specs
  Clarify external artifacts only working when GitLab pages is enabled
  Send SIGSTP before SIGTERM to actually give Sidekiq jobs 30s to finish when the memory killer kicks in
  Remove an exception from the git user default SSH config check
  Geo route whitelisting is too optimistic
  Update .nvmrc to current stable (v9.0.0)
  Update documentation
  Address Douwe's feedback
  Refactor responsive table styles to support nested error block
  Add changelog items
  Update specs for sudo behavior
  Move RSS and incoming email tokens from User Settings > Accounts to User Settings > Access Tokens
  Remove user authentication_token column
  Migrate user private tokens to personal access tokens
  Add sudo API scope
  Consistently use PersonalAccessToken instead of PersonalToken
  Remove User#private_token
  ...

Remove Filesystem check metrics that use too much CPU to handle requests

See merge request gitlab-org/gitlab-ce!15158

Resolve "Add a `merge_request_diff_id` column to `merge_requests`"

See merge request gitlab-org/gitlab-ce!15035

Refactor responsive table styles to support nested error block

See merge request gitlab-org/gitlab-ce!15145

Incorporate Gitaly's OperationService.UserFFBranch RPC

Closes gitaly#693

See merge request gitlab-org/gitlab-ce!15040

Once we migrate existing MRs to have this column, we will be able to get the
latest diff for a single merge request more efficiently, and (more importantly)
get all latest diffs for a collection of MRs efficiently.

We already had this the other way around (merge_request_diffs.merge_request_id),
but this is needed to gather only the most recent diffs for a set of merge
requests.

Update .nvmrc to v9.0.0 (current stable)

See merge request gitlab-org/gitlab-ce!15149

Convert Icons in CI to SVG Sprite Icons

See merge request gitlab-org/gitlab-ce!14567

Document GitLab pages prerequisite with external HTML artifacts

See merge request gitlab-org/gitlab-ce!15153

Send SIGSTP before SIGTERM to actually give Sidekiq jobs 30s to finish when the memory killer kicks in

See merge request gitlab-org/gitlab-ce!15102

Remove Private Tokens

Closes #38595 and #38447

See merge request gitlab-org/gitlab-ce!14838

Remove an exception from the git user default SSH config check

See merge request gitlab-org/gitlab-ce!15151

Remove useless closeReopenReport specs

Closes gitlab-ee#3890

See merge request gitlab-org/gitlab-ce!15133

Prompted to add this note from
https://gitlab.com/gitlab-org/gitlab-ce/issues/34102#note_45522526

Send SIGSTP before SIGTERM to actually give Sidekiq jobs 30s to finish when the memory killer kicks in

Use `count` expectation on `all` finder for patient specs (address flakey recent searches specs)

Closes #34435

See merge request gitlab-org/gitlab-ce!14961

Clarify the weights that identify issues for beginners

See merge request gitlab-org/gitlab-ce!15138

CE port of code changed for epics

See merge request gitlab-org/gitlab-ce!15144

Measure Gitaly migration sites against original

See merge request gitlab-org/gitlab-ce!15118

Make NamespaceSelect change URL when filtering

Closes #37277

See merge request gitlab-org/gitlab-ce!14888

Geo route whitelisting is too optimistic

Closes gitlab-ee#3274

See merge request gitlab-org/gitlab-ce!15082