Allow the review-deploy and review-qa-* jobs to fail for now

See merge request gitlab-org/gitlab-ce!29208

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

Ruby 2.6 offers better performance and memory usage:
https://www.rubyguides.com/2018/11/ruby-2-6-new-features/

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/57323

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

By moving it to the `build` stage and adding `action: stop` to it.

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

Also, play manual jobs once dependency jobs are done instead of polling
for the dependent jobs to be finished.

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

Ensure that the cleanup starts right away.

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

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

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