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/include/connection_setup.inc

@@ -75,7 +75,7 @@ truncate table performance_schema.hosts;
 
 # Start from a known clean state, to avoid noise from previous tests
 flush tables;
-flush status;
+flush global status;
 
 --disable_warnings
 drop procedure if exists dump_all;

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

@@ -145,7 +145,7 @@ update performance_schema.setup_instruments set enabled='YES', timed='YES'
 
 # Start from a known clean state, to avoid noise from previous tests
 flush tables;
-flush status;
+flush global status;
 truncate performance_schema.events_waits_summary_by_thread_by_event_name;
 truncate performance_schema.events_waits_summary_by_account_by_event_name;
 truncate performance_schema.events_waits_summary_by_user_by_event_name;

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

@@ -2,7 +2,7 @@
 
 # Set a known initial state for the test
 
-flush status;
+flush global status;
 flush hosts;
 flush user_resources;
 flush privileges;

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

@@ -106,7 +106,7 @@ update performance_schema.setup_instruments set enabled='YES', timed='YES'
 
 # Start from a known clean state, to avoid noise from previous tests
 flush tables;
-flush status;
+flush global status;
 truncate performance_schema.memory_summary_by_thread_by_event_name;
 truncate performance_schema.memory_summary_by_account_by_event_name;
 truncate performance_schema.memory_summary_by_user_by_event_name;

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

@@ -69,7 +69,7 @@ update performance_schema.setup_instruments set enabled='YES', timed='YES';
 
 # Start from a known clean state, to avoid noise from previous tests
 flush tables;
-flush status;
+flush global status;
 truncate performance_schema.events_stages_summary_by_thread_by_event_name;
 truncate performance_schema.events_stages_summary_global_by_event_name;
 truncate performance_schema.events_stages_history;

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

@@ -133,7 +133,7 @@ update performance_schema.setup_consumers set enabled='YES';
 
 # Start from a known clean state, to avoid noise from previous tests
 flush tables;
-flush status;
+flush global status;
 
 create table test.t1(a int, b int, c int, d int default 0,
   primary key(a),

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

@@ -4,7 +4,7 @@
 update performance_schema.setup_consumers set enabled='NO';
 truncate performance_schema.events_waits_history_long;
 drop table test.marker;
-flush status;
+flush global status;
 update performance_schema.setup_instruments set enabled='YES';
 update performance_schema.setup_consumers set enabled='YES';
 

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

@@ -18,5 +18,5 @@ show global status like 'performance_schema_%';
 
 # Cleanup
 truncate performance_schema.events_waits_history_long;
-flush status;
+flush global status;
 

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

@@ -47,7 +47,7 @@ update performance_schema.setup_instruments set enabled='YES'
 truncate table performance_schema.events_waits_history_long;
 
 # Reset lost counters to a known state
-flush status;
+flush global status;
 
 # Make sure there is room to instrument tables from this test.
 flush tables;