Commit fe80f76d from !4094 (#3364108)

Closes #3412361

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• 7fbfa413...7b49d870 - 2 commits from branch project:11.x
• d635fecf - Merge branch '11.x' into 3412361-ckeditor5-validatable

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• 009e8934 - Remove duplicate method from EditorValidationTest

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• 009e8934...18125a46 - 117 commits from branch project:11.x
• bc6d88b1 - Merge remote-tracking branch 'origin/11.x' into 3412361-ckeditor5-validatable

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• 7f72bacd - Add missing update path test.

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• 5556eea8 - Add missing update path test.

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• 9a8c8248 - PHPStan

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• 2138c653 - Add missing update path.

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• 3bd94632 - Apply https://en.wikipedia.org/wiki/Robustness_principle

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• 06a65895 - Add explicit test coverage for `editor.editor.*:format`.
• 61a453b8 - Expand test coverage for `ConfigExists` constraint.

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• 0a011ea3 - Expand capabilities of `ConfigExists` constraint and use it for validating...

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• b46e912b - Revert unintentional method declaration order swap that resulted in diff noise.
• 3388acb6 - Revert all changes that now live in #3416223.

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• 892f78ef - As long as this MR lands before #3416223, this tiny test expectation change is unnecessary.

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• f493ad6a - Per @phenaproxima review: narrow `ConfigExistsConstraint::$prefix`.

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