We had some dead code left over from the removal of registration runners. Registration runners were removed in #859#1207
Co-authored-by: Yusuke Kuoka <ykuoka@gmail.com>
This feature flag was provided from ARC to runner container automatically to let it use `--ephemeral` instead of `--once` by default. As the support for `--once` is being dropped from the runner image via #1384, we no longer need that.
Ref #1196
Adds some unit tests for the runner pod generation logic that is used internally by runner deployment and runner set controllers as preparation for #1282