Remove experimental gate from Queues metrics APIs

[KennethRuan]

Summary

This PR removes the experimental gate from the Queue metrics APIs.

It ungates the three features:

• Add env.QUEUE.metrics() method MQ-1154
• Add response body with metrics to env.QUEUE.send() and env.QUEUE.sendBody() MQ-1200
• Add metrics to queue() handler MQ-1202

The upstream services that call workerd have been updated:

• PR in queue-broker-worker
• PR in miniflare

Changes

1. The Javascript API for send() and sendBatch() now call WorkerQueue::sendWithResponse and WorkerQueue::sendBatchWithResponse respectively.

2. metrics(): Promise<QueueMetrics> definition on queue binding is no longer gated behind experimental flag

3. readonly metadata: MessageBatchMetadata definition on queue() handler is no longer gated behind experimental flag

4. Removed reference to METADATA_FLAG and the flag disabled cases in tests.

5. Types regenerated using just generate-types

Testing

• bazel test //src/workerd/api/tests:queue-test@ //src/workerd/api/tests:queue-metrics-test@ //src/workerd/api/tests:queue-metadata-test@ //src/workerd/api/tests:queue-metrics-sentinel-test@ //src/workerd/api/tests:queue-producer-metadata-test@
• bazel test //src/workerd/api/tests:queue-test@all-compat-flags //src/workerd/api/tests:queue-metrics-test@all-compat-flags //src/workerd/api/tests:queue-metadata-test@all-compat-flags //src/workerd/api/tests:queue-metrics-sentinel-test@all-compat-flags //src/workerd/api/tests:queue-producer-metadata-test@all-compat-flags
• Tested experimental workers locally with Miniflare and in production queues

[codspeed-hq]

Merging this PR will not alter performance

✅ 72 untouched benchmarks
⏩ 129 skipped benchmarks¹

---

_{Comparing KennethRuan:graduate-queues-metrics-from-experimental (a94fc17) with main (80a327c)}

Footnotes

1. 129 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.85%. Comparing base (e6407c3) to head (a94fc17).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6557      +/-   ##
==========================================
- Coverage   70.88%   70.85%   -0.04%     
==========================================
  Files         438      438              
  Lines      123484   123642     +158     
  Branches    19426    19455      +29     
==========================================
+ Hits        87534    87606      +72     
- Misses      24442    24513      +71     
- Partials    11508    11523      +15     

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