fix: Error when no simulators are available

[dpogue]

Platforms affected

iOS

Motivation and Context

Closes GH-526.
Closes GH-1366.
Closes GH-1377.
Closes GH-1469.

Description

Changed getDefaultSimulatorTarget() to reject with an error message when no simulators are found.

This should at least return a useful and actionable error message to the end user, rather than "Cannot read property name of undefined".

Testing

Existing unit tests pass.
Added unit test to confirm the function now rejects when no simulators are present.

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.36%. Comparing base (1aea8e7) to head (cc17e9f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1470      +/-   ##
==========================================
+ Coverage   78.35%   78.36%   +0.01%     
==========================================
  Files          16       16              
  Lines        1825     1826       +1     
==========================================
+ Hits         1430     1431       +1     
  Misses        395      395              

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[erisu]

LGTM