[BugFix] Metrics streaming releases intermediate/incomplete results

[joe-elliott]

What this PR does:
Fixes a situation where intermediate metrics results are released during TraceQL streaming. For most metrics streams this doesn't matter. However, some metrics functions (like topk) when released early will create inconsistent results.

Before:

After:

The approach taken in this PR was to use the same "shard tracking" functionality currently used for the most_recent query hint. The query_range combiner logic has been updated to only release metrics when we know that all jobs that could impact a particular time range are complete.

Pros:

• future proof. the results are complete when returned
• already streamed results don't change value after being returned

Cons:

• more complex
• "slower" experience for the user

Streaming Before

before.mp4

Streaming After

after.mp4

Other Changes

• Updated docker-compose examples to have a streaming and non-streaming datasource

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]