[WeiQuan0605]

• A short explanation of the proposed change:
  Adds structured observability logs at the HTTP request and background job level for the package upload, package download, and resource matching flows. Complements the lower-level blobstore and storage-cli logs added in PR #5575 by providing a higher-level view of what triggered each operation.

New log events emitted:

Event	Logger	When
package_upload.request.start/accepted/failed	cc.api.packages	POST /v3/packages/:guid/upload
package_download.request.start/done	cc.api.packages	GET /v3/packages/:guid/download
package_upload.action.start/enqueued/failed	cc.action.package_upload	Job enqueue inside PackageUpload
package_upload.job.start/done/failed	cc.background	PackageBits job execution
resource_match.request.start/done	cc.api.resource_matches	POST /v3/resource_matches
resource_match.exists.call	cc.resource_pool	Per-resource blobstore check (debug level)

ResourceMatchPresenter now accepts a pre-parsed array to avoid double Oj.load per request.

• An explanation of the use cases your change solves

  • Correlate a cf push request ID across HTTP handler → job enqueue → job execution → blobstore operations
  • Measure end-to-end package upload latency (request accept time vs. job processing time)
  • Observe resource matching cache hit rates and per-size-bucket timing without enabling debug logging globally
  • Distinguish slow uploads from slow resource matching when diagnosing cf push performance

• Links to any other associated PRs
  Add structured logs and Prometheus metrics for blobstore and packer operations #5575

• I have reviewed the contributing guide

• I have viewed, signed, and submitted the Contributor License Agreement

• I have made this pull request to the main branch

• I have run all the unit tests using bundle exec rake

• I have run CF Acceptance Tests