feat(resourceserver): add FOSSology status endpoint for release

[Sandipmandal25]

Issue: #4050

Adds a new endpoint GET /releases/{id}/fossology to return FOSSology processing info for a release. The existing checkFossologyProcessStatus endpoint returns a generic response and does not clearly show each step. This endpoint provides a clear view of the workflow with upload, scan and report status.

The data is read from ExternalToolProcess already stored in SW360. No live FOSSology API calls are made.

How To Test?

1. Trigger FOSSology processing for a release
2. Call GET /releases/{id}/fossology
3. Check that the response includes uploadStatus, scanStatus, reportStatus,
   uploadId, sourceAttachmentId and availableReportFormats (after scan is done)

No new tests added since this only reads existing data.

Suggest Reviewer

@GMishx
@deo002

Checklist

Must:

• All related issues are referenced in commit messages and in PR format

[Sandipmandal25]

Keeping this in draft for now. will do a final pass on dto usage and edge cases before marking it ready.