Flag errors from psql when restoring from backups

When a database restore from PostgreSQL finishes, it's easy to miss
important errors that cause significant issues down the road. For
example, in https://gitlab.com/gitlab-org/gitlab/-/issues/36405, the
primary key constraint in `application_settings` was not able to be
created due to duplicate keys present.

With this change, we now:

1. Track all messages from stderr

2. Filter out messages with `does not exist`. These are present because
`pg_dump` is run with the `--clean` argument to issue DROP statements,
but `--if-exists` will filter this out automatically
(https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40792).

3. If there are any error messages, play them back to the user with
a warning that these errors may impact GitLab.

4. Prompt the user to continue.

Merge branch '238111-count-of-the-number-of-self-hosted-smtp-configurations-by-package' into 'master'

Add mail.smtp_server to usage ping data

See merge request gitlab-org/gitlab!39844

Make file upload button on MR edit page tab-accessible

See merge request gitlab-org/gitlab!40995

Quarantine failing multi-project_pipelines_spec.rb

See merge request gitlab-org/gitlab!41128

Add push mirroring use case for regulated companies

See merge request gitlab-org/gitlab!40735

Docs: dev FF follow-up

Closes #241470 and #241504

See merge request gitlab-org/gitlab!40518

- Improve order
- Add note saying dev FFs != GL's FFs
- Link to presentation

Add Microsoft and Google style guides as backups

See merge request gitlab-org/gitlab!39791

Update incident docs

See merge request gitlab-org/gitlab!41078

Add run and debug instructions for monitor specs

See merge request gitlab-org/gitlab!39100

Update Chrome & Chromedriver to version 85 in the QA image

See merge request gitlab-org/gitlab!41100

Add custom metric importer

See merge request gitlab-org/gitlab!37773

Use dompurify on individual issue fields

See merge request gitlab-org/gitlab!41044

Bump doorkeeper to 5.3.0

See merge request gitlab-org/gitlab!40929

Simplify the Review App deployment by leveraging response from API call

See merge request gitlab-org/gitlab!41095

Fix Lint/UriRegexp cop

See merge request gitlab-org/gitlab!41117

Update Gitaly version

See merge request gitlab-org/gitlab!41141

Remove GIT_SSL_NO_VERIFY from DS docs

See merge request gitlab-org/gitlab!39528

Added test for Vulnerabilities::FindingSerializer

See merge request gitlab-org/gitlab!40462

Fix Style/MultilineIfModifier cop

See merge request gitlab-org/gitlab!41113

Clarify that a license is needed for the Elastic settings

See merge request gitlab-org/gitlab!41138

NOT NULL constraint to target_project_id column

Closes #233507

See merge request gitlab-org/gitlab!40836

Fix Style/CommentedKeyword cop

See merge request gitlab-org/gitlab!41119

Resolve "Update axios to 0.20.0"

Closes #243735

See merge request gitlab-org/gitlab!40967

Signed-off-by: Rémy Coutable <remy@rymai.me>

Send the value of the smtp_server along with usage ping

Track event for downloading group coverage CSV

See merge request gitlab-org/gitlab!40754