[TypeDeclarationDocblocks] Deprecate AddReturnDocblockFromMethodCallDocblockRector

[TomasVotruba]

AddReturnDocblockFromMethodCallDocblockRector was experimental and never made it into any set - it sat commented out in TypeDeclarationDocblocksLevel behind a @todo test first note.

The rule copies the @return docblock of the called method onto the caller. That is risky: the source docblock is unverified, and if it is incorrect or outdated, the rule spreads the wrong type further into the codebase.

 final class SomeController
 {
+    /**
+     * @return SomeEntity[]
+     */
     public function getAll(): array
     {
         return $this->repository->findAll();
     }
 }

 final class Repository
 {
     /**
      * @return SomeEntity[]
      */
     public function findAll(): array
     {
         // ...
     }
 }

If Repository::findAll() docblock lies, the lie is now in two places.

Rule now implements DeprecatedInterface and throws on refactor(), same as the recently deprecated data provider docblock rules (#8235). Tests and fixtures removed.