* SQL: Same updateCacheUnreads for all DBs
Use same SQL update request for MySQL / MariaDB than the one we already used for PostgreSQL / SQLite (i.e. using a sub-query).
Testing on a DB of 688MB with 270k entries, 199 feeds, 19 categories, using MySQL 8.1.0.
The new SQL update using a sub-query took in average 0.02s, while the old SQL update using a join took in average 0.05s. SQL cache was properly invalidated between each run. The new SQL request is thus about twice faster.
Another advantage of the SQL update using a sub-query is that it works identically in PostgreSQL, SQLite, MariaDB, MySQL, so we do need different versions anymore.
Contributes to https://github.com/FreshRSS/FreshRSS/issues/5008#issuecomment-1709755370
* Force USE INDEX
* Use same SQL methods also for markReadEntries, markReadCat
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