Optimize count updation in CounterCache behavior.

Use sub query to update the count instead of separate queries to
fetch and update the count.

Update phpstan config for ORM package

Revert "replace @method docbloc with @mixin where possible"

This reverts commit 6881cbc4098f345864b3a622708707dff7f7c73b.

Remove phpstan as dev dependency from split packages.

Use the phpstan version from the main composer.json for split package checks for consistency.

Fix BehaviorRegistry::unload() for camelcase methods

I missed a case in the previous fix/backport. I'll port these changes to
5.x after this merges.

Refs #17697

Fix BehaviorRegistry::unload() for camelcase methods

I missed a case in the previous fix/backport. I'll port these changes to
5.x after this merges.

Refs #17697

Merge pull request #17762 from Harfusha/Rector_UP_TO_PHP_81

Rector fixes from rule set LevelSetList::UP_TO_PHP_81

Fix removeBehavior not clearing state

When behaviors are unloaded we should clear up the additional method
mappings that BehaviorRegistry collects.

Fixes #17697

Fix removeBehavior not clearing state

When behaviors are unloaded we should clear up the additional method
mappings that BehaviorRegistry collects.

Fixes #17697

Fix removeBehavior not clearing state

When behaviors are unloaded we should clear up the additional method
mappings that BehaviorRegistry collects.

Fixes #17697