Skip the statistics refresh when nothing transitioned

🤖 AI wrote this code from my instructions.

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This MR is human verified: I read the full diff and ran the tests myself, because your time is as valuable as mine.

What does this MR do and why?

BaseAutoStateTransitionService#execute schedules Vulnerabilities::Statistics::AdjustmentWorker after every run, whether or not the block transitioned anything. AutoDismissService and AutoResolveService reach it on every pipeline where a policy applies, so a pipeline that changes nothing still enqueues a job.

The third sibling already guards the same call:

Service	Inherits the base	Guard
AutoDismissService	yes	none
AutoResolveService	yes	none
AutoSeverityOverrideService	no, there is a TODO to make it	refresh_statistics if override_count > 0

This applies the same condition in the base. If nothing transitioned, the statistics cannot have moved.

Exactly two classes call super do. AutoDismissService initialises @dismissed_count = 0 and AutoResolveService returns .size, so count is always an integer and the comparison is safe.

I have not measured how often the count is zero in production, so the saving is "one Sidekiq job per no-op run" rather than a figure.

References

None.

How to set up and validate locally

bundle exec rspec ee/spec/services/vulnerabilities/auto_resolve_service_spec.rb ee/spec/services/vulnerabilities/auto_dismiss_service_spec.rb

115 examples, 0 failures. Reverting the guard alone fails the new example with expected: 0 times with any arguments / received: 1 time.

The sibling service and both workers also stay green:

bundle exec rspec ee/spec/services/vulnerabilities/auto_severity_override_service_spec.rb ee/spec/workers/vulnerabilities/auto_dismiss_worker_spec.rb ee/spec/workers/vulnerabilities/auto_severity_override_worker_spec.rb

94 examples, 0 failures.

MR acceptance checklist

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