[CDC] Reset WAL retention time when a table doesn't have any more CDC streams

[hectorgcr]

Jira Link: DB-1895
When we create a CDC stream, we are modifying the WAL retention time for all the tablets in a table, but we need to revert this once a table doesn't have a stream.

The default WAL retention time is 5 minutes when there is no CDC stream, and 4 hours when there is a CDC stream, so we should avoid keeping logs for 4 hours when they are not needed (no CDC stream on the table).

This is related to #2050

[hectorgcr]

Since we now support log retention by min replicated id, we should remove this automatic increase of the log retention time. The only thing I need to confirm is that as soon as a stream is created for a specific tablet, we start retaining the log files.

[hectorgcr]

Related to #3317

[bmatican]

This is how we setup 2DC now: https://docs.yugabyte.com/latest/deploy/multi-dc/2dc-deployment/#root

We can also use yb-ctl with a different start_id, so we create 2 clusters locally, and then link them as such.

If I understand correctly, we should be able to completely remove the master driven WAL retention time, if we automatically turn on op id retention, when we turn on a stream. @nspiegelberg can you confirm this and perhaps share some code pointers?