feat: InsertAt patch location + secondary patch for service_account_missing

[drmorr0]

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Description

• Adds the InsertAt patch location for annotations
• Updates the service_account_missing check to use this patch location as a secondary patch alternative

Testing done

• make test (new tests added for InsertAt)

[codecov]

Codecov Report

Attention: Patch coverage is 91.34615% with 9 lines in your changes missing coverage. Please review.

Project coverage is 73.18%. Comparing base (6fbf91f) to head (2266f08).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
sk-cli/src/validation/annotated_trace.rs	91.07%	5 Missing ⚠️
...li/src/validation/rules/service_account_missing.rs	91.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
+ Coverage   72.91%   73.18%   +0.27%     
==========================================
  Files          56       56              
  Lines        3020     3107      +87     
==========================================
+ Hits         2202     2274      +72     
- Misses        818      833      +15     

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