EE: Make sure two except won't overwrite each other

Closes gitlab-qa#140

See merge request gitlab-org/gitlab-ee!3827

Ee fix cluster enviroment missing

Closes #4361

See merge request gitlab-org/gitlab-ee!3806

This is a pretty boring solution, but I can't
think of a good idea right now and this might be
good enough for now...

Optimize QA pipeline and don't run irrelevant jobs

Closes gitlab-qa#140

See merge request gitlab-org/gitlab-ce!15977

[Geo] Update disaster recovery document

See merge request gitlab-org/gitlab-ee!3804

Rename CI job `clair` to `sast:image`

See merge request gitlab-org/gitlab-ee!3816

[EE] Use dedicated runners for all the CI jobs

See merge request gitlab-org/gitlab-ee!3791

Improve bidirectional mirroring docs

See merge request gitlab-org/gitlab-ee!3802

Geo: Show sync percent on bar graph and count within tooltips

Closes #4330

See merge request gitlab-org/gitlab-ee!3794