Hide growth tab disabled

[prschulz]

Got some code for us? Awesome 🎊!

Please take a minute to explain the change you're making:

• Why are you making it?
  To resolve NY-382. The "Growth" tab in post analytics was incorrectly displayed even when the "Member Sources" setting was disabled, leading to inconsistent UI and user confusion.

• What does it do?
  This PR conditionally hides the "Growth" tab in the post analytics header. The tab will now only be visible if the members_track_sources setting is enabled. An e2e test has been added to verify this behavior.

• Why is this something Ghost users or developers need?
  Users: Ensures a consistent and logical experience. If member source tracking is disabled, users expect related analytics to be hidden, preventing confusion and improving trust in the analytics data.
  Developers: Improves the accuracy of the UI based on settings and adds a robust e2e test to prevent regressions.

Please check your PR against these items:

• I've read and followed the Contributor Guide
• I've explained my change
• I've written an automated test to prove my change works

We appreciate your contribution! 🙏

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Linear Issue: NY-382

 

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