Updated cybereason code to fix the issue #1215

[thangaraj-ramesh]

1. Changes done to treat both AND as OR operator between multiple observations.
2. Updated code to display alternate error message "Cybereason does not support AND operator between fields" when unsupported Cybereason fields are attempted to be combined using AND operator. Added relevant unit test cases.

[codecov]

Codecov Report

Base: 84.66% // Head: 84.68% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (22ffcf2) compared to base (e904922).
Patch coverage: 98.57% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1224      +/-   ##
===========================================
+ Coverage    84.66%   84.68%   +0.02%     
===========================================
  Files          557      557              
  Lines        41435    41490      +55     
===========================================
+ Hits         35080    35135      +55     
  Misses        6355     6355              

Impacted Files	Coverage Δ
...odules/darktrace/stix_transmission/error_mapper.py	100.00% <ø> (ø)
...r_modules/darktrace/stix_transmission/connector.py	93.43% <91.66%> (+0.51%)	⬆️
...s/cybereason/stix_translation/query_constructor.py	95.11% <100.00%> (+0.31%)	⬆️
.../stix_translation/test_cybereason_stix_to_query.py	98.93% <100.00%> (+0.02%)	⬆️
...darktrace/test/stix_transmission/test_darktrace.py	100.00% <100.00%> (ø)

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