Skip Multiplatform iOS tests if XCode is not configured

[cortinico]

Fixes #3617

[chao2zhang]

From the CI result, we probably need to catch IOException if xcode-select is not found.

[schalkms]

From the CI result, we probably need to catch IOException if xcode-select is not found.

or even better to check whether the host OS is actually a Mac

[cortinico]

From the CI result, we probably need to catch IOException if xcode-select is not found.

or even better to check whether the host OS is actually a Mac

I've included both 👍

[codecov]

Codecov Report

Merging #3734 (719c125) into main (50b453b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #3734   +/-   ##
=========================================
  Coverage     78.04%   78.04%           
  Complexity     2883     2883           
=========================================
  Files           473      473           
  Lines          9300     9300           
  Branches       1767     1767           
=========================================
  Hits           7258     7258           
  Misses         1078     1078           
  Partials        964      964           

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[BraisGabin]

👏👏