Avoid to mutate original request on CRUDController::batchAction()

[phansys]

Subject

Avoid to mutate original request on CRUDController::batchAction().

I am targeting this branch, because this change respects BC.

Follow up of #6271.

Changelog

### Fixed
- Fixed mutating the original request at `CRUDController::batchAction()`.

[jordisala1991]

There is a psalm failure non related to this Pr that should be fixed

[phansys]

There is a psalm failure non related to this Pr that should be fixed

I'm not familiarized with psalm, so I don't know if these issues are fixable or if we should add them as allowed failures at psalm-baseline.xml.

[phansys]

@jordisala1991, do you have any clue? Otherwise, I'd like to avoid tying this PR to the psalm failure.

[VincentLanglet]

@jordisala1991, do you have any clue? Otherwise, I'd like to avoid tying this PR to the psalm failure.

Maybe @vladyslavstartsev can help us.

I made #6322

I may understand badly the issue, but I would consider this as a psalm bug.
When using new ArrayCollection(), psalm considers this as ArrayCollection<array-key, empty> but I would expect this to be ArrayCollection<array-key, mixed> instead.

Adding /** @var ArrayCollection<object> $collection */ fix the issues.

[jordisala1991]

Have you check if everything works as expected?

[phansys]

Have you check if everything works as expected?

Yes, at least with batchActionDelete() everything is working as expected.

[jordisala1991]

Thank you @phansys