Dumped tasks are disconnected from their batch

[Mubelotix]

Describe the bug

Batch uids get set to null on all tasks when dumped.

meilisearch/crates/index-scheduler/src/scheduler/process_dump_creation.rs

Lines 86 to 90 in f4903c2

	// Patch the task to remove the batch uid, because as of v1.12.5 batches are not persisted.
	// This prevent from referencing *future* batches not actually associated with the task.
	//
	// See <https://github.com/meilisearch/meilisearch/issues/5247> for details.
	t.batch_uid = None;

This should have been removed when #5247 was fixed.

To Reproduce

1. Perform a dump

Expected behavior

Batch uids should be stored

Meilisearch version:

branch main, all versions since v1.13