chore(router): observability on job iterator discards & stop iteration if throttled with destination isolation enabled

[atzoum]

Description

Adding a counter for monitoring discarded jobs in router's iterator and stopping iteration in case jobs are discarded due to throttling and destination isolation is enabled

Notion Ticket

Link

Security

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

BEGIN_COMMIT_OVERRIDE
chore(router): observability on job iterator discards & stop iteration if throttled with destination isolation enabled #3491
END_COMMIT_OVERRIDE

[codecov]

Codecov Report

Patch coverage: 75.75% and no project coverage change.

Comparison is base (b525949) 68.01% compared to head (20246c7) 68.01%.

❗ Current head 20246c7 differs from pull request most recent head d1eaa01. Consider uploading reports for the commit d1eaa01 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3491   +/-   ##
=======================================
  Coverage   68.01%   68.01%           
=======================================
  Files         330      330           
  Lines       53574    53591   +17     
=======================================
+ Hits        36437    36450   +13     
- Misses      14740    14745    +5     
+ Partials     2397     2396    -1     

Impacted Files	Coverage Δ
router/types/types.go	91.11% <ø> (ø)
router/isolation/isolation.go	82.35% <33.33%> (-10.51%)	⬇️
router/handle.go	73.21% <85.18%> (+1.36%)	⬆️

... and 7 files with indirect coverage changes

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