chore(ACI): Update metric issue dual processing metrics

[ceorourke]

Follow up to #91979 to only track when there is at least one action in process_workflows and differentiate between fires and resolves in the subscription processor. Previously I wanted them added together but now that we've realized we're not reaching process_workflows for resolutions I want to be able to determine if the number of fires is accurate.

[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 1:156309 in /home/runner/work/sentry/sentry/.artifacts/pytest.junit.xml

Additional details and impacted files

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  Files       10168    10168           
  Lines      582904   582907    +3     
  Branches    22595    22595           
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+ Hits       482410   482424   +14     
+ Misses      99206    99195   -11     
  Partials     1288     1288