refactor(webflux): remove unused IDs query aggregate functionality

[Ahoo-Wang]

• Remove IdsQueryAggregateHandlerFunction and related classes
• Delete corresponding test cases
• Update WebFluxAutoConfiguration to remove bean definition
• Remove IdsQueryAggregateRouteSpecFactory from service loader configuration

[github-actions]

Test Results

1 126 tests   - 1   1 109 ✅  - 1   10m 11s ⏱️ +33s
  313 suites  - 1      17 💤 ±0 
  313 files    - 1       0 ❌ ±0 

Results for commit 57191f4. ± Comparison against base commit 586e52c.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.95%. Comparing base (586e52c) to head (57191f4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1157      +/-   ##
============================================
- Coverage     89.01%   88.95%   -0.06%     
+ Complexity     3184     3166      -18     
============================================
  Files           653      651       -2     
  Lines         11404    11357      -47     
  Branches        778      778              
============================================
- Hits          10151    10103      -48     
- Misses          761      762       +1     
  Partials        492      492              

Flag	Coverage Δ
unittests	88.95% <ø> (-0.06%)	⬇️

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.