MDEV-33145 Add FLUSH GLOBAL STATUS

- FLUSH GLOBAL STATUS now resets most global_status_vars.
  At this stage, this is mainly to be used for testing.
- FLUSH SESSION STATUS added as an alias for FLUSH STATUS.
- FLUSH STATUS does not require any privilege (before required RELOAD).
- FLUSH GLOBAL STATUS requires RELOAD privilege.
- All global status reset moved to FLUSH GLOBAL STATUS.
- Replication semisync status variables are now reset by
  FLUSH GLOBAL STATUS.
- In test cases, the only changes are:
  - Replace FLUSH STATUS with FLUSH GLOBAL STATUS
  - Replace FLUSH STATUS with FLUSH STATUS; FLUSH GLOBAL STATUS.
    This was only done in a few tests where the test was using SHOW STATUS
    for both local and global variables.
- Uptime_since_flush_status is now always provided, independent if
  ENABLED_PROFILING is enabled when compiling MariaDB.
- @@global.Uptime_since_flush_status is reset on FLUSH GLOBAL STATUS
  and @@session.Uptime_since_flush_status is reset on FLUSH SESSION STATUS.
- When connected, @@session.Uptime_since_flush_status is set to 0.

mysql-test/suite/perfschema/t/start_server_no_index.test

@@ -53,8 +53,8 @@ select COUNT_STAR from performance_schema.table_io_waits_summary_by_index_usage
 select variable_value > 0 from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';
 
-# While at it, check that FLUSH STATUS Resets the lost counter
-FLUSH STATUS;
+# While at it, check that FLUSH GLOBAL STATUS Resets the lost counter
+FLUSH GLOBAL STATUS;
 
 select variable_value from information_schema.global_status
   where variable_name like 'PERFORMANCE_SCHEMA_INDEX_STAT_LOST';