Remove constant CIVICRM_MYSQL_STRICT
I'd like to propose fully removing the handling of CIVICRM_MYSQL_STRICT from CiviCRM. It's one of 2 things that are affected by isDevelopment and the 2 are conceptually quite different - in that one can make the configured mysql mode stricter and the other can make the configured php level less strict (because some production sites possibly cannot alter their php error_level config).
The scope of this gitlab is purely the CIVICRM_MYSQL_STRICT setting.
The reason I think we should remove it is simply that I think it's obsolete now. When it was added most developers were on old mysql version as were our tests. There was high risk of developing things on dev settings that would break cutting edge site configs.
However, I think the vast majority of developers are automatically at a strict level now just by virtue of the movement of time, as are most live sites and our tests. I don't think we need to have code to increase the strictness of mysql standards anymore