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

• [x] 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 :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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