ccl/multiregionccl: skip flaky regional_by_row test

[matthewtodd]

Part of #98020.

Release note: None

[cockroach-teamcity]

This change is 

[matthewtodd]

Thanks, @rafiss!

bors r+

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)

[blathers-crl]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error setting reviewers, but backport branch blathers/backport-release-23.1-100139 is ready: POST https://api.github.com/repos/cockroachdb/cockroach/pulls/100184/requested_reviewers: 422 Reviews may only be requested from collaborators. One or more of the teams you specified is not a collaborator of the cockroachdb/cockroach repository. []

Backport to branch 23.1.x failed. See errors above.

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