Bug#53102 perfschema.pfs_upgrade fails when executed direct after mysql_upgrade

Implemented post review comments.

Added --force to the mysql_upgrade command in the test scripts,
so that the test output does not depends on whether other tests involving an
upgrade have been executed or not in the same test suite execution.

mysql-test/suite/perfschema/include/upgrade_check.inc

@@ -18,7 +18,7 @@
 #
 
 --error 1
---exec $MYSQL_UPGRADE --skip-verbose > $out_file 2> $err_file
+--exec $MYSQL_UPGRADE --skip-verbose --force > $out_file 2> $err_file
 
 # Verify that mysql_upgrade complained about the performance_schema
 --cat_file $err_file