changefeedccl: add log messages for when a core changefeed retries/fails

[andyyang890]

Epic: CRDB-37337

Release note: None

[blathers-crl]

It looks like your PR touches production code but doesn't add or edit any test code. Did you consider adding tests to your PR?

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[cockroach-teamcity]

This change is 

[rharding6373]

Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @asg0451)

[andyyang890]

TFTRs!

bors r=wenyihu6,rharding6373

[craig]

Build succeeded:

• local_roachtest_fips
• lint
• linux_amd64_build
• local_roachtest
• macos_arm64_build
• docker_image_amd64
• linux_arm64_build
• unit_tests
• linux_amd64_fips_build
• windows_build
• examples_orms
• macos_amd64_build
• acceptance
• check_generated_code

[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 ca6e32e to blathers/backport-release-23.1-127530: 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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_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}