ci: configure rules to enable dependent jbos in continuous pipeline

Apply the rules from commit ff72dbfb14 (gitlab-ci: configure rules to
enable continuous builds of staged MRs, 2020-09-30, v3.19.0-rc1~70^2~1)
and commit 71665c8cb9 (gitlab-ci: Clarify conditions enabling jobs for
continuous build of stage, 2021-05-05, v3.21.0-rc1~218^2) to dependent
jobs too.