[CIVIS-8549] better skipped tests and suites support

[anmarchenko]

What does this PR do?
Solves multiple issues around skipped tests and test suites:

• all frameworks now correctly report test suite as skipped if there are no passed and no failed tests
• Cucumber now correctly reports undefined scenarios as skipped (if not running in strict mode)
• Cucumber strict mode support: in strict mode undefined scenarios are marked as failed
• RSpec: previously pending tests with failures were reported without any status, now they are reported as skipped

Motivation
Wrapping up last bugs and problems before GA for Ruby

Additional Notes
As Ruby test frameworks mostly do not provide statuses of test suites (and do not care much about the concept of a test suite), now we track count of passed/failed/skipped tests per test suite in Datadog::CI::TestSuite object

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d1034f0) 98.96% compared to head (a637995) 99.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
+ Coverage   98.96%   99.04%   +0.07%     
==========================================
  Files         151      151              
  Lines        6469     6676     +207     
  Branches      299      296       -3     
==========================================
+ Hits         6402     6612     +210     
+ Misses         67       64       -3     

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