Summary:
Change default value of `enable_ysql_operation` to true.

Also changes the default value of `master_ysql_operation_lease_ttl_ms` to 30 seconds.
Jira: DB-15889

Original commit: 53146f9da4877244f931761920a5159a5b8da412 / D43709

Test Plan: Existing tests.

Reviewers: amitanand

Reviewed By: amitanand

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D43806