Remove dora_metrics_dashboard feature flag

Ezekiel Kigborequested to merge
542910-cleanup-dora-metrics-dashboard-ff into master

What does this MR do and why?

Remove dora_metrics_dashboard feature flag

The dora_metrics_dashboard feature flag has been enabled by default since 18.5 and is ready to be removed.

This change:

  • Removes the feature flag configuration file
  • Updates ProductAnalyticsHelpers to remove the feature flag check
  • Removes push_frontend_feature_flag calls from controllers
  • Updates tests to remove feature flag stubs
  • Adds test coverage for dora_metrics_dashboard_enabled? method

NOTE: A follow-up MR will remove the unused code !211705

References

Screenshots or screen recordings

No visual changes - the feature flag is already default enabled

How to set up and validate locally

MR acceptance checklist

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Related to #542910

Edited by Ezekiel Kigbo

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