Convert CCS blocker to component

[cPholloway]

Case RE-78: This change converts the CCS blocker to a component.

* Remove the CCS blocker
* Export the CCS data to a secure directory prior to starting leapp
* Remove the CCS package prior to starting leapp
* Remove some cruft that the CCS package leaves behind prior to leapp
* Install the CCS package after leapp completes
* Import the CCS data after leapp completes

Changelog: Convert CCS blocker to component

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[cPholloway]

^ this is just the rebase on main

[troglodyne]

So, my only overall commentary about this is mostly about ways this could have potentially been made faster/simpler. Basically this is just running the pkgacct processes I already had code for and then the restorepkg bits after restore, which should work, but is a bit "inefficient" in our context. Testing on a server with an obnoxious amount of users and data and a server with very few users/data is as such advisable from a performance standpoint. I'm not actually sure whether the amount of inefficiency here will actually matter.

That said, doing the following would have been simpler/more efficient execution-wise (but taken more time to code potentially?):

• Backup ccs_persistence.json from /var/cpanel/ccs/
• Run pg_dump specifying the version we intend to move to. The complication here is having the newest version of pg_dump which understands all these older versions installed.
• Uninstall.
• Elevate.
• Reinstall.
• Flush task queue.
• Stop CCS.
• use pg_restore with the --clean opt to restore the DB dump onto our cluster.
• Overwrite ccs_persistence.json
• Re-run /opt/cpanel-ccs/bin/rebuildccsconfig to reimpose the old UUIDs.
• Start CCS.

[troglodyne]

If we wind up needing to do pg_dump for customer DB migration, then we probably should revisit this component to share code for that in the future.

[cPholloway]

^ this is just a rebase on main

[cPholloway]

^ rebase on main