MDEV-39252 Add REMOVED_STARTUP_OPTIONS in INFORMATION_SCHEMA listing

[lefred]

This patch creates an INFORMATION_SCHEMA table with all the options that are considered as removed but ignored (MARIADB_REMOVED_OPTION):

MariaDB [information_schema]> SELECT * FROM INFORMATION_SCHEMA.REMOVED_STARTUP_OPTIONS;
+---------------------------+--------------+--------------+-------------------------------+----------+
| OPTION_NAME               | OPTION_VALUE | SOURCE       | CONFIG_FILE                   | HANDLING |
+---------------------------+--------------+--------------+-------------------------------+----------+
| innodb-log-files-in-group | 2            | CONFIG       | /dev/shm/var_auto_3zrj/my.cnf | IGNORED  |
| innodb-thread-concurrency | 8            | COMMAND_LINE | NULL                          | IGNORED  |
+---------------------------+--------------+--------------+-------------------------------+----------+
2 rows in set (0.001 sec)

The MTR test must be executed with --nowarning.

MTR output:

==============================================================================

TEST                                      RESULT   TIME (ms) or COMMENT
--------------------------------------------------------------------------

worker[01] Using MTR_BUILD_THREAD 300, with reserved ports 19000..19029
sys_vars.removed_options                 [ pass ]      1
--------------------------------------------------------------------------
The servers were restarted 0 times
Spent 0.001 of 14 seconds executing testcases

Completed: All 1 tests were successful.