fix: Various issues identified by code scanning

[dpogue]

Platforms affected

iOS

Motivation and Context

Resolves some issues that were flagged by code scanning.

Description

• Ensure temporary test projects are always cleaned up
• Fix some bad regexes

Testing

Existing tests pass.

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.95%. Comparing base (c995cd2) to head (6199d25).

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1508       +/-   ##
===========================================
+ Coverage        0   80.95%   +80.95%     
===========================================
  Files           0       16       +16     
  Lines           0     1848     +1848     
===========================================
+ Hits            0     1496     +1496     
- Misses          0      352      +352     

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