feat(observability): deployment (OTel collector + Parca/eBPF)

[Ma77Ball]

What changes were proposed in this PR?

Provides the local deployment wiring that receives and stores telemetry. Default-off and isolated from the application services.

• Adds an OpenTelemetry Collector configuration and wires it into the single-node docker-compose stack.
• Adds the Parca server configuration and the Parca eBPF agent for continuous profiling.
• Updates the single-node up.sh and .env to start the observability backends.
• Infrastructure only; the application runs unchanged whether or not these services are started.

Any related issues, documentation, or discussions?

Closes: #5369
Part of #4070. Stacked on #5376.

How was this PR tested?

• Configuration-validation specs for the collector and Parca config.
• sbt scalafmtCheckAll passes; the build runs in this PR's CI.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.8 in compliance with ASF

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.22507% with 101 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.17%. Comparing base (7a38b6c) to head (d927cff).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ala/org/apache/texera/observability/OtelInit.scala	63.30%	43 Missing and 8 partials ⚠️
...org/apache/texera/observability/TexeraTracer.scala	0.00%	14 Missing ⚠️
...rg/apache/texera/observability/TexeraMetrics.scala	84.93%	4 Missing and 7 partials ⚠️
...la/org/apache/texera/observability/SpanAttrs.scala	66.66%	8 Missing and 2 partials ⚠️
...e/texera/observability/TexeraOtelLogAppender.scala	72.22%	4 Missing and 6 partials ⚠️
...org/apache/texera/observability/LogSanitizer.scala	96.42%	0 Missing and 1 partial ⚠️
.../texera/service/ComputingUnitManagingService.scala	0.00%	1 Missing ⚠️
...cala/org/apache/texera/service/ConfigService.scala	0.00%	1 Missing ⚠️
.../scala/org/apache/texera/service/FileService.scala	0.00%	1 Missing ⚠️
...ache/texera/service/WorkflowCompilingService.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5377      +/-   ##
============================================
+ Coverage     54.89%   56.17%   +1.27%     
+ Complexity     2962     1860    -1102     
============================================
  Files          1117      847     -270     
  Lines         43133    34932    -8201     
  Branches       4648     3543    -1105     
============================================
- Hits          23680    19623    -4057     
+ Misses        18064    14336    -3728     
+ Partials       1389      973     -416     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.14% <100.00%> (+0.14%)	⬆️
agent-service	34.36% <ø> (ø)		Carriedforward from f6bf45d
amber	65.22% <71.96%> (+8.16%)	⬆️
computing-unit-managing-service	0.00% <0.00%> (ø)
config-service	50.76% <0.00%> (-0.80%)	⬇️
file-service	58.88% <0.00%> (-0.15%)	⬇️
frontend	48.01% <ø> (-0.61%)	⬇️	Carriedforward from f6bf45d
notebook-migration-service	78.57% <ø> (ø)
pyamber	90.15% <ø> (-0.05%)	⬇️	Carriedforward from f6bf45d
python	90.76% <ø> (ø)		Carriedforward from f6bf45d
workflow-compiling-service	54.74% <0.00%> (-0.41%)	⬇️

*This pull request uses carry forward flags. Click here to find out more.

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[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @bobbai00, @Yicong-Huang, @aglinxinyuan
  You can notify them by mentioning @bobbai00, @Yicong-Huang, @aglinxinyuan in a comment.