Skip call manager test on macos

[lnjX]

• Clean up CallManager test
• Skip call manager tests on macOS

PR check list:

• Document your code
• Add \since QXmpp 1.X, QXMPP_EXPORT
• Fix doxygen warnings (see log when building with -DBUILD_DOCUMENTATION=ON)
• Update doc/doap.xml
• Add unit tests
• Format the code: Run clang-format -i src/<edited-file(s)> tests/<edited-file(s)>

[codecov]

Codecov Report

Base: 68.50% // Head: 68.50% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (1dbd761) compared to base (19c9d12).
Patch coverage: 87.50% of modified lines in pull request are covered.

❗ Current head 1dbd761 differs from pull request most recent head 7d95f33. Consider uploading reports for the commit 7d95f33 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
- Coverage   68.50%   68.50%   -0.01%     
==========================================
  Files         292      292              
  Lines       25673    25674       +1     
==========================================
  Hits        17587    17587              
- Misses       8086     8087       +1     

Impacted Files	Coverage Δ
tests/qxmppcallmanager/tst_qxmppcallmanager.cpp	98.30% <87.50%> (-1.70%)	⬇️

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