cleanup queues for non-existent pools and non-existent tasks

[stishkin]

closes #2432

[codecov-commenter]

Codecov Report

Merging #2433 (440f2a8) into main (de766df) will increase coverage by 0.18%.
The diff coverage is 5.55%.

@@            Coverage Diff             @@
##             main    #2433      +/-   ##
==========================================
+ Coverage   29.64%   29.83%   +0.18%     
==========================================
  Files         282      289       +7     
  Lines       33492    35116    +1624     
==========================================
+ Hits         9928    10476     +548     
- Misses      23564    24640    +1076     

Impacted Files	Coverage Δ
.../ApiService/ApiService/Functions/TimerRetention.cs	0.00% <0.00%> (ø)
src/ApiService/ApiService/onefuzzlib/Queue.cs	31.31% <0.00%> (-2.03%)	⬇️
...rc/ApiService/ApiService/onefuzzlib/ShrinkQueue.cs	0.00% <0.00%> (ø)
...ApiService/ApiService/onefuzzlib/PoolOperations.cs	36.91% <100.00%> (+0.42%)	⬆️
src/agent/coverage/src/code.rs	14.41% <0.00%> (-5.24%)	⬇️
src/agent/onefuzz/src/fs.rs	55.55% <0.00%> (-4.37%)	⬇️
...c/agent/dynamic-library/src/bin/dynamic-library.rs	2.38% <0.00%> (-0.40%)	⬇️
src/agent/onefuzz-agent/src/worker.rs	62.00% <0.00%> (-0.38%)	⬇️
src/agent/onefuzz/src/process.rs	1.33% <0.00%> (-0.16%)	⬇️
src/agent/onefuzz/src/asan.rs	0.00% <0.00%> (ø)
... and 25 more

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[stishkin]

..