[workflow] Allow to override jobs in flow

  * Allow to pass env.CI_JOBS_OVERRIDES in pre-formatter yaml text:
    CI_JOBS_OVERRIDES = 'kaas-testing-core-release-artifact'                : 3505
                       'reindex-testing-core-release-index-with-rc'        : 2822
   to be able override some steps in flow.
   "JobName" taken always and only from 'description' - to mitigate
   overriding different steps with same 'job'

PRODX-11849

Change-Id: Ic956980973ae7f1f86a054b54eac792dd12a1e4f
1 file changed