Deleting `AutoScale` table entries on vmss shutdown.

[nharper285]

Summary of the Pull Request

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PR Checklist

• [ ] Applies to work item: #3446
• [ ] CLA signed. If not, go over here and sign the CLI.
• [ ] Tests added/passed
• [ ] Requires documentation to be updated
• [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

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Validation Steps Performed

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[codecov-commenter]

Codecov Report

Merging #3455 (73cd430) into main (c4d0cd7) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3455      +/-   ##
==========================================
- Coverage   34.47%   34.46%   -0.01%     
==========================================
  Files         299      299              
  Lines       36202    36209       +7     
==========================================
  Hits        12479    12479              
- Misses      23723    23730       +7     

Files Changed	Coverage Δ
src/ApiService/ApiService/onefuzzlib/AutoScale.cs	0.00% <ø> (ø)
...ervice/ApiService/onefuzzlib/ScalesetOperations.cs	4.60% <0.00%> (-0.06%)	:arrow_down: