cache: unsubscribe removed resources on reconnects

[sschepens]

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When reconnections occur, envoy sends a new request subscribing to all the resources it currently had. If a resource has just been removed, we fail to notify Envoy the the resource has been removed.

This happens because on the very first stream request, we dont have any trackedResources, we should instead also check pendingResources.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4577722) 86.16% compared to head (154e449) 86.24%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #320      +/-   ##
============================================
+ Coverage     86.16%   86.24%   +0.08%     
- Complexity      361      363       +2     
============================================
  Files            42       42              
  Lines          1178     1178              
  Branches         97       97              
============================================
+ Hits           1015     1016       +1     
+ Misses          116      115       -1     
  Partials         47       47              

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