Reland "Reland "Enable Buildbucket V2 flow for skia.primary""

This reverts commit 8bfde4619021582ec14299d535980fe841d32240.

Reason for revert: submitted fix and added alerts

Original change's description:
> Revert "Reland "Enable Buildbucket V2 flow for skia.primary""
>
> This reverts commit caeb4e89b9ce5ec7b1140811573388d2ac0a3018.
>
> Reason for revert: Buildbucket failing to update
>
> Original change's description:
> > Reland "Enable Buildbucket V2 flow for skia.primary"
> >
> > This reverts commit 3b4f89b8885c5d2cf1afc2af5b24a89f37aff2c8.
> >
> > Reason for revert: fix landed, try again
> >
> > Original change's description:
> > > Revert "Enable Buildbucket V2 flow for skia.primary"
> > >
> > > This reverts commit 1ade562521eda4c241e50d7add1ee444cac65e38.
> > >
> > > Reason for revert: Needs https://skia-review.googlesource.com/c/k8s-config/+/814161 but nobody is around to review.
> > >
> > > Original change's description:
> > > > Enable Buildbucket V2 flow for skia.primary
> > > >
> > > > Bug: b/288158829
> > > > Change-Id: I58d346ad55d061f4e5a2d02fdec9fcd8f3d58396
> > > > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/813536
> > > > Reviewed-by: Kevin Lubick <kjlubick@google.com>
> > >
> > > Bug: b/288158829
> > > Change-Id: Ica391c30bd4f2367e8c677979a7814907e6b5262
> > > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/813661
> > > Reviewed-by: Kevin Lubick <kjlubick@google.com>
> > > Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> >
> > Bug: b/288158829
> > Change-Id: I88525bf311c823554721e9dc1c0616f02dba3342
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/814696
> > Auto-Submit: Eric Boren <borenet@google.com>
> > Reviewed-by: Kevin Lubick <kjlubick@google.com>
> > Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
>
> Bug: b/288158829
> Change-Id: I90a7d7ba97fad05675c85c1dddb94635a4400f6b
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/816516
> Auto-Submit: Eric Boren <borenet@google.com>
> Reviewed-by: Kevin Lubick <kjlubick@google.com>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>

Bug: b/288158829
Change-Id: Ide3cedf67df290faae8efb1fe371afce3f59e7fc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/824916
Reviewed-by: Kevin Lubick <kjlubick@google.com>