feat(ACI): Handle anomaly detection data condition in validator

[ceorourke]

Update the metric issue validator to handle anomaly detection data condition input - the main difference with these is that comparison is a dictionary rather than a number.

[ceorourke]

self.initial_data is a list of conditions in some cases (e.g. the case where we're subclassing it for the MetricIssueComparisonConditionValidator)

[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 2 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/incidents/metric_issue_detector.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #93886       +/-   ##
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+ Coverage   76.56%   88.04%   +11.47%     
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  Files       10338    10337        -1     
  Lines      597261   597030      -231     
  Branches    23193    23193               
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+ Hits       457316   525634    +68318     
+ Misses     139484    70935    -68549     
  Partials      461      461