Allow specifying libcxx builder image. (#110303) This change attempts to shift the libc++ builders over to new backend infrastructure that allows running an arbitrary container for the libc++ job. This has been a long time in the making, and support from github and gke is finally at the point where it's possible (hopefully). This change should also demonstrate another important property: No Downtime Upgrades. If this goes well, we'll be able to test the upgrade as a part of the PR process, and then commiting it to main should (ideally) not break anything.
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