Revert "[autoroll] Skip the initial repo manager update."
Revert "[autoroll] Skip the initial repo manager update."

This reverts commit b67b94914e5211956273690b63d6247a106c2127.

Reason for revert: Doesn't help; the repo manager parent performs an initial sync itself and needs to do some setup afterward, so we can't skip it.

Original change's description:
> [autoroll] Skip the initial repo manager update.
>
> This will prevent crash loops on rollers where the sync is broken for
> some reason, which will make manual fixes via `kubectl exec` easier.
>
> Change-Id: I2c0be65b0084b7a208f1d5d72b07d51ecca09a0f
> Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/573941
> Reviewed-by: Ravi Mistry <rmistry@google.com>
> Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

Change-Id: I6cd50a4d4fe38fb80db3f502e9e56700239daaa0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/574076
Auto-Submit: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Commit-Queue: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot