cockroachdb / cockroachdb/cockroach
changefeedccl: add tests for ALTER CHANGEFEED that assert on checkpoint content
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Description
We currently already have tests that implicitly test that checkpoints are correctly written during ALTER CHANGEFEED by making sure we see the right events afterwards. However, we don't have any tests that actually assert on the content of the checkpoint. If those tests existed, it would've allowed us to catch [this bug](https://github.com/cockroachdb/cockroach/pull/148617#discussion_r2166979005) sooner.
Jira issue: CRDB-51832
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