[7.0.2 Cherry-pick] Fix fetching signature verification result from cache

[github-actions]

Cherry-pick of #4339 (3488b36) into release/7.0.

[paulmedynski]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[codecov]

Codecov Report

❌ Patch coverage is 63.46154% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.50%. Comparing base (6d73cce) to head (84e8c30).
⚠️ Report is 1 commits behind head on release/7.0.

Files with missing lines	Patch %	Lines
...osoft/Data/SqlClient/SignatureVerificationCache.cs	75.00%	11 Missing ⚠️
...src/Microsoft/Data/SqlClient/SqlSecurityUtility.cs	0.00%	8 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (6d73cce) and HEAD (84e8c30). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (6d73cce)	HEAD (84e8c30)
CI-SqlClient	2	0

Additional details and impacted files

@@               Coverage Diff               @@
##           release/7.0    #4343      +/-   ##
===============================================
- Coverage        75.23%   65.50%   -9.73%     
===============================================
  Files              280      275       -5     
  Lines            43859    65850   +21991     
===============================================
+ Hits             32997    43137   +10140     
- Misses           10862    22713   +11851     

Flag	Coverage Δ
CI-SqlClient	?
PR-SqlClient-Project	65.50% <63.46%> (?)

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