Use Request Batch API when modifying item request queue

The purpose of this story is to modify existing logic, which deals with request position updates (the main candidate is org.folio.circulation.domain.RequestQueueRepository#updateRequestsWithChangedPositions method, seems this is the only place), to use Request Batch API (see CIRCSTORE-164) instead of sending separate update for each request.

It has already implemented for CIRC-446, decide whether we can use a single method for both cases.

Acceptance Criteria:

• The updateRequestsWithChangedPositions method is refactored;
• Related unit tests refactored and passed;
• Since the method is used in the various cases, it should be good to verify it manually on the env, following cases will be affected:
  • Check out (with request fulfillment);
  • Request creation;
  • Request cancellation;
  • Request removal; (seems UI does not use this endpoint, tested via API)
  • Request move.