CDC: support resolved messages with db-level feeds for pubsub and kafka

*Description*

All db-level changefeeds set split column families which is not compatible with resolved for pubsub and kafka.

See this code in changefeed_stmt:

if opts.IsSet(changefeedbase.OptResolvedTimestamps) &&
opts.IsSet(changefeedbase.OptSplitColumnFamilies) {
return errors.Newf("Resolved timestamps are not currently supported with %s for this sink"+
" as the set of topics to fan them out to may change. Instead, use TABLE tablename FAMILY familyname"+
" to specify individual families to watch.", changefeedbase.OptSplitColumnFamilies)
}

To fix, we'd need to make changes to the topic namer to dynamically generate a list of topics.

Then we'd be able to add coverage more coverage with DB-level feeds metamorphic testing.
We may also be able to add this ability for table level feeds.

Jira issue: CRDB-57276

Epic CRDB-1421