add deep dependencies endpoint

[adityachopra29]

Which problem is this PR solving?

• Resolves Create dummy /deep-dependencies endpoint #6606

Description of the changes

• Create endpoint api/deep-dependencies for ddg.
• Adds code for it to server

How was this change tested?

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: npm run lint and npm run test

[codecov]

Codecov Report

Attention: Patch coverage is 10.81081% with 33 lines in your changes missing coverage. Please review.

Project coverage is 95.83%. Comparing base (384203d) to head (4c624a3).

Files with missing lines	Patch %	Lines
cmd/query/app/analytics/http_gateway.go	0.00%	33 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6654      +/-   ##
==========================================
- Coverage   96.00%   95.83%   -0.17%     
==========================================
  Files         363      364       +1     
  Lines       20603    20639      +36     
==========================================
  Hits        19780    19780              
- Misses        628      663      +35     
- Partials      195      196       +1     

Flag	Coverage Δ
badger_v1	9.82% <ø> (ø)
badger_v2	1.82% <ø> (ø)
cassandra-4.x-v1-manual	14.79% <ø> (ø)
cassandra-4.x-v2-auto	1.81% <ø> (ø)
cassandra-4.x-v2-manual	1.81% <ø> (ø)
cassandra-5.x-v1-manual	14.79% <ø> (ø)
cassandra-5.x-v2-auto	1.81% <ø> (ø)
cassandra-5.x-v2-manual	1.81% <ø> (ø)
elasticsearch-6.x-v1	19.12% <ø> (ø)
elasticsearch-7.x-v1	19.20% <ø> (ø)
elasticsearch-8.x-v1	19.37% <ø> (ø)
elasticsearch-8.x-v2	1.82% <ø> (ø)
grpc_v1	10.80% <ø> (ø)
grpc_v2	7.81% <ø> (ø)
kafka-3.x-v1	10.12% <ø> (ø)
kafka-3.x-v2	1.82% <ø> (ø)
memory_v2	1.82% <ø> (ø)
opensearch-1.x-v1	19.25% <ø> (ø)
opensearch-2.x-v1	19.25% <ø> (ø)
opensearch-2.x-v2	1.82% <ø> (ø)
tailsampling-processor	0.48% <ø> (ø)
unittests	94.72% <10.81%> (-0.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[yurishkuro]

Please see comments in #6608, the same applies here

[adityachopra29]

@yurishkuro the /deep-dependencies url seems to be working, but there are some issues.

• Actually jaeger-ui tries to find a focalNode (ie focalService and focalOperation), which is chosen from all the operations of the chosen service. Hence there doesnt seem to be a simple way of just hardcoding the deep-dependencies.
  To show the working in the ui, I chose the hotrod example and a specific service (namely driver) to show the rendering.
• I tried to set a default value for the focalNode as a temporary solution, but the problem remains that the focalService and focalOperation will have to exist for this to work.

REC-20250203235503.mp4

• As per your suggestion, I changed the backend to /api/deep-dependencies. However, the frontend still looks for the backend data on /analytics/v1/dependencies . So we will need to raise a PR in the ui repo for the same.