Reparent test failures

[deepthi]

There are a bunch of failures in this GH action run: https://github.com/vitessio/vitess/runs/1098675951

It turns out that schema tracking is creating errant GTIDs that then prevent us from performing replication related operations like ResetReplication and WaitForPosition.

To work around this temporarily, the fix is to disable schema tracking in https://github.com/vitessio/vitess/blob/master/go/test/endtoend/reparent/main_test.go like this:

		clusterInstance.VtTabletExtraArgs = []string{
			"-lock_tables_timeout", "5s",
			"-enable_semi_sync",
			"-track_schema_versions=false", // remove this line once https://github.com/vitessio/vitess/issues/6474 is fixed
		}

Once #6474 is fixed, the option line should be removed so that we can verify that schema tracking works well even when we reparent.