feat(insights): make failure_rate generic to any span

[DominikB2014]

Previously failure_rate was specific to trace.status and it was used to show transaction failure_rate, however this doesn't work generically for any span type. This Pr updates failure_rate to be generic to any span type by using span.status instead. For transaction spans, span.status is trace.status anyways so it will still work as expected, this can be verified in explore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

⚠️ Parser warning

The parser emitted a warning. Please review your JUnit XML file:

Warning while parsing testcase attributes: Limit of string is 1000 chars, for name, we got 2083 at 1:156719 in /home/runner/work/sentry/sentry/.artifacts/pytest.junit.xml

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #92140       +/-   ##
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+ Coverage   59.00%   87.87%   +28.86%     
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  Files       10175    10181        +6     
  Lines      583070   583456      +386     
  Branches    22613    22613               
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+ Hits       344061   512691   +168630     
+ Misses     238557    70313   -168244     
  Partials      452      452