changefeedccl: db level feeds: correctly integrate tablefilters into the tableset watcher

Integrate the work from #147420 into the tableset watcher. The only complexity there will be resolving the fully qualified names.

Jira issue: CRDB-56231

Epic CRDB-55919

Start by reading issue #147420 and locating the changefeed tableset watcher mentioned here. Trace how table filters and fully qualified names are represented, then integrate the referenced work so database-level feeds apply the filters correctly. Done means the watcher handles table filters with fully qualified names and the relevant tests pass.

Written by the indexing model from the issue text.