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MDEV-29409 Buffer overflow in my_wc_mb_filename() on RENAME TABLE
dict_table_rename_in_cache(), dict_table_get_highest_foreign_id(): Reserve sufficient space for the fkid[] buffer, and ensure that the fkid[] will be NUL-terminated. The fkid[] must accommodate both the database name (which is already encoded in my_charset_filename) and the constraint name (which must be converted to my_charset_filename) so that we can check if it is in the format databasename/tablename_ibfk_1 (all encoded in my_charset_filename).
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