changefeedccl: add telemetry into which version changefeeds were created

There is some changefeed behavior that is influenced by the version in which the changefeed was created. When making changes to changefeedccl internals, it can be useful to know the impact of changes by having visibility into how many changefeeds were created at a specific version (e.g., determining the impact of migrations for https://github.com/cockroachdb/cockroach/issues/109702). Today we could only do this manually by looking at the legacy_payload in every cluster's sytem.job_info table.

This issue is a request to introduce telemetry that tracks # of changefeeds by the version number it was started in.

Jira issue: CRDB-35969