Validate if there are any tablet based keyspaces

[karol-kokoszka]

... and fail the process if there are any, and they are not filtered out by the "--keyspaces" flag.

[VAveryanov8]

The way I see how we can check if keyspace is tablet based or not is following:

1. Check the value of scylla.yaml enable_tablets. https://opensource.docs.scylladb.com/stable/reference#confval-enable_tablets
2. If it is false - then there is not way to create tablet based keyspace - we good to go with 1-1-restore.
3. if it's set to true, every keyspace by default is tablet based, but there is an option to opt out - CREATE KEYSPACE .... WITH tablets = {'enabled': false} , so we need to see how the keyspace was created. Unfortunately system_schema.keyspace and scylladb/gocql doesn't expose this option, so the only way I found is to check (parse) the output of DESCRIBE SCHEMA WITH INTERNALS.

@Michal-Leszczynski @karol-kokoszka what do you think? Maybe you know a better way of checking if keyspace is tablet based or not?