[BOM Improvements] - Link Materials to RR on Submission

[wavehassman]

Description

When a Reimbursement Request is submitted, automatically link any selected materials to the RR and update their status to "Ready to Order".

Acceptance Criteria

• When RR is created/submitted, for each product that has a materialId:
  - Update the material's reimbursementRequestId to the created RR's ID
  - Update the material's status to "READY_TO_ORDER"

• Multiple materials can be linked to the same RR (multiple products)

• Materials without a linked RR product remain unchanged

• Non-project products (string-based) are not affected

• Changes are transactional - if RR creation fails, material updates are rolled back