Refactored code to use PHP8 attributes instead of annotations

In this change, Doctrine and validation annotations have been replaced with PHP8 Attributes. The Rector tool has been configured with a list of annotations to convert to attributes. As a consequence, the PHPStan's rules have been updated to reflect these changes. The PHP8's nullable operator (?) has been added where required, and comments in field declaration have been replaced with #[Attribute] syntax.

phpstan-baseline-deprecations-doctrine-orm.neon

@@ -0,0 +1,50 @@
+# See https://github.com/doctrine/orm/issues/11313 for a follow-up
+parameters:
+	ignoreErrors:
+		-
+			message: """
+				#^Fetching deprecated class constant ASC of class Doctrine\\\\Common\\\\Collections\\\\Criteria\\:
+				use Order\\:\\:Ascending instead$#
+			"""
+			count: 1
+			path: src/Bundle/ChillCustomFieldsBundle/Entity/CustomFieldsGroup.php
+
+		-
+			message: """
+				#^Fetching deprecated class constant ASC of class Doctrine\\\\Common\\\\Collections\\\\Criteria\\:
+				use Order\\:\\:Ascending instead$#
+			"""
+			count: 1
+			path: src/Bundle/ChillMainBundle/Entity/Notification.php
+
+		-
+			message: """
+				#^Fetching deprecated class constant DESC of class Doctrine\\\\Common\\\\Collections\\\\Criteria\\:
+				use Order\\:\\:Descending instead$#
+			"""
+			count: 1
+			path: src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/AccompanyingPeriodWork.php
+
+		-
+			message: """
+				#^Fetching deprecated class constant DESC of class Doctrine\\\\Common\\\\Collections\\\\Criteria\\:
+				use Order\\:\\:Descending instead$#
+			"""
+			count: 1
+			path: src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/AccompanyingPeriodWorkEvaluation.php
+
+		-
+			message: """
+				#^Fetching deprecated class constant DESC of class Doctrine\\\\Common\\\\Collections\\\\Criteria\\:
+				use Order\\:\\:Descending instead$#
+			"""
+			count: 2
+			path: src/Bundle/ChillPersonBundle/Entity/Household/Household.php
+
+		-
+			message: """
+				#^Fetching deprecated class constant DESC of class Doctrine\\\\Common\\\\Collections\\\\Criteria\\:
+				use Order\\:\\:Descending instead$#
+			"""
+			count: 2
+			path: src/Bundle/ChillPersonBundle/Entity/Person.php