Document Q2 2025 releases

These are the new features in the Q2 2025 release batch. Please, make sure they're all either documented or doesn't need to be:

MDEV-35850 make HOSTNAME a cmake configure variable
MDEV-10164 Add support for TRIGGERS that fire on multiple events
MDEV-12182 audit plugin should log HOST:PORT of incoming connection
MDEV-14091 Support for passphrase protected keys
MDEV-20034 Add support for the pre-defined weak SYS_REFCURSOR
MDEV-20299 SET SESSION AUTHORIZATION
MDEV-22491 Support mariadb-check and CHECK TABLE with SEQUENCE
MDEV-27669 Not possible to check whether a server was started with skip-slave-start option
MDEV-32732 Support DESC indexes in loose scan optimization
MDEV-33834 Add tls_version field for connection audit plugins
MDEV-34137 Implement the GIS function ST_Validate
MDEV-34138 Implement the GIS function MBRCoveredBy
MDEV-34141 Implement the GIS function ST_Simplify
MDEV-34158 Implement the GIS function ST_GeoHash
MDEV-34159 Implement the GIS function ST_LatFromGeoHash
MDEV-34160 Implement the GIS function ST_LongFromGeoHash
MDEV-34276 Implement the GIS function ST_IsValid
MDEV-34277 Implement the GIS function ST_PointFromGeoHash
MDEV-34278 Implement the GIS function ST_Collect
MDEV-34712 Implement SHA2 support for file_key_management.so plugin (TDE)
MDEV-34822 Skip FK checks in Galera during applying in IST
MDEV-34860 Implement MAX_EXECUTION_TIME hint
MDEV-34870 Implement join order hints
MDEV-34888 Implement subquery optimizer hints
MDEV-35504 MySQL 8-style optimizer hints: milestone 1
MDEV-36099 Ensure that creation and usage of temporary tables in replication is predictable