fix: adding throttling stats in router

[fracasula]

Description

Adding throttling stats in router.

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Base: 47.85% // Head: 47.87% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (342ab9e) compared to base (ba270c2).
Patch coverage: 90.90% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/1.5.x    #2923      +/-   ##
=================================================
+ Coverage          47.85%   47.87%   +0.01%     
=================================================
  Files                314      314              
  Lines              49933    49925       -8     
=================================================
+ Hits               23894    23900       +6     
+ Misses             24597    24586      -11     
+ Partials            1442     1439       -3     

Impacted Files	Coverage Δ
router/router.go	76.27% <90.90%> (-0.19%)	⬇️
jobsdb/jobsdb.go	74.80% <0.00%> (+0.13%)	⬆️
processor/processor.go	86.36% <0.00%> (+0.41%)	⬆️
...rvices/streammanager/kafka/client/testutil/util.go	70.87% <0.00%> (+3.88%)	⬆️

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