[timeseries] Adding timeseries language endpoint and UI integration

[shauryachats]

Summary

This PR introduces support for retrieving and displaying enabled time series query languages configured at the broker level as a part of #16287.

• Controller API: Created new /timeseries/languages API to fetch languages from controller config pinot.timeseries.languages. (the same timeseries configs as broker and server).
• UI Enhancements: Updated the TimeseriesQueryPage React component to dynamically fetch and display supported timeseries query languages:
  • Query editor and form controls are disabled when no languages are enabled.
  • A warning banner is shown if no languages are configured.
  • Language selector dropdown is populated based on broker response.
• Client API: Added getTimeSeriesLanguages() to requests/index.ts for UI to call the new controller endpoint.

Since the response from the broker can be variable, the UI components are not hidden but disabled for editing.

Testing

Verified for both cases where timeseries is enabled and not enabled.

Timeseries Enabled UI

Timeseries Disabled UI

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.18%. Comparing base (1a476de) to head (c0c16af).
⚠️ Report is 528 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/org/apache/pinot/controller/ControllerConf.java	0.00%	7 Missing ⚠️
...i/resources/PinotControllerTimeseriesResource.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16424      +/-   ##
============================================
+ Coverage     62.90%   63.18%   +0.27%     
+ Complexity     1386     1363      -23     
============================================
  Files          2867     3004     +137     
  Lines        163354   174091   +10737     
  Branches      24952    26641    +1689     
============================================
+ Hits         102755   109993    +7238     
- Misses        52847    55709    +2862     
- Partials       7752     8389     +637     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.16% <0.00%> (+0.29%)	⬆️
java-21	63.15% <0.00%> (+0.33%)	⬆️
skip-bytebuffers-false	?
skip-bytebuffers-true	?
temurin	63.18% <0.00%> (+0.27%)	⬆️
unittests	63.17% <0.00%> (+0.27%)	⬆️
unittests1	56.31% <ø> (+0.49%)	⬆️
unittests2	33.18% <0.00%> (-0.39%)	⬇️

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[shauryachats]

The failing test org.apache.pinot.integration.tests.WindowResourceAccountingTest is failing on master branch as well.

Root caused it and looks like it happened due to #16360 after adding

Tracing.unregisterThreadAccountant();

in the aforementioned integration test. Removing this line fixes the test.
@vrajat could you please check?

[vrajat]

I am checking the failure. I did repro on my laptop. Surprised - since all tests passed in my PR.

[vrajat]

I know the root cause. I'll work on a fix and open a PR.
Also - this only affects tests since Tracing.unregisterThreadAccountant(); is only called in tests

[vrajat]

Draft PR: #16439