feat: bulk CSV background jobs setup

[matzduniuk]

This PR addresses #6384

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

• Adds new BackgroundJobs controller, service, and module files.
• Adds new database table for BackgroundJobs records and enums
• Adds new prisma migration script
• Adds integration and e2e tests for the new changes

How Can This Be Tested/Reviewed?

1. Re-set up the backend application to apply new migrations.

2. Using Postman, perform the following operations:
   2a. Create a new background job using the POST /jobs endpoint, providing a valid listingId (copy one from Prisma Studio → listing table) and any string value for inputS3Key. The response should return a BackgroundJob object with status: "processing".

   2b. Using the same listingId, attempt to create a second job using the POST /jobs endpoint again — this should return a 409 Conflict error, confirming that duplicate active jobs for the same listing are blocked.

   2c. Using the listingId from step 3a, retrieve the currently active job using the GET /jobs?listingId= endpoint. The response should return the same job object created in 3a.

   2d. Copy the id field from the response in 3a and retrieve the job directly using the GET /jobs/ endpoint. Confirm the returned object matches.

Tip

The above steps should also be performed using invalid data — missing or malformed body fields on POST, a non-> UUID listingId, an unrecognised job ID on the GET by ID endpoint, and requests with the passkey or Authorization > > header omitted — to verify proper error and validation handling.

4. Open Prisma Studio, navigate to the background_job table, and manually update the status of the job created in step 3a from processing to completed
5. Using Postman, repeat the GET /jobs?listingId= request from step 3c — the response should now return null, confirming that completed jobs are not surfaced as active
6. Using Postman, send the POST /jobs request again with the same listingId — this should succeed and return a new 7. BackgroundJob with status: "processing", confirming that a new job can be created once the previous one is no longer active

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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[YazeedLoonat]

looks good but a few tweaks