roachtest/awsdms: run once a week instead

[otan]

Save a bit of mad dosh by running awsdms once a weekly instead of daily. We don't need this tested every week.

Epic: None

Release note: None

[cockroach-teamcity]

This change is 

[smg260]

I think the only 2 tags required here are weekly and aws-weekly. The former gets special treatment in roachtest [1], and the latter is required to actually run it in the weekly aws job.

[1] - test_registry.go
[2] - roachtest_weekly_aws_impl.sh

[otan]

thanks! amended.

[otan]

bors r=Jeremyyang920

[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 creating merge commit from b5e2041 to blathers/backport-release-22.2-108160: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 22.2.x failed. See errors above.

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error creating merge commit from b5e2041 to blathers/backport-release-23.1-108160: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

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

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