WL#8383: Remove compatibility SQL modes

Affects: Server-8.0   —   Status: Complete   —   Priority: Medium

This WL removes sql_mode flags:

* DB2
* MSSQL
* MYSQL323
* MYSQL40
* NO_FIELD_OPTIONS
* NO_KEY_OPTIONS
* NO_TABLE_OPTIONS
* ORACLE
* POSTGRESQL

A separate WL#9465 removes the MAXDB flag.


See WL#9465 for requirements.