This adds a Revert two-step button to the JobVersions component for
not-current versions, which redirects to the overview on success. It
checks the job version before and after reversion to mitigate the edge
case where reverting to an otherwise-identical version has no effect, as
discussed in #10337.
It uses existing facilities for handling other errors and disabling the
button when permissions are lacking.
Manual interventions:
• decorators on the same line for service and controller
injections and most computed property macros
• preserving import order when possible, both per-line
and intra-line
• moving new imports to the bottom
• removal of classic decorator for trivial cases
• conversion of init to constructor when appropriate
