feat: gtfs feature tracker feature flag

[Alessandro100]

Summary:

Added feature flag for gtfs feature tracker

Expected behavior:

You should not be able to access the gtfs feature tracker through the UI as the feature flag is false, you can still directly navigate to it. Once this PR goes in, I'll enable it on dev and qa environments

Testing tips:

Go in the app, you should not see the gtfs feature tracker link in header, footer or in search page

Please make sure these boxes are checked before submitting your pull request - thanks!

• Run the unit tests with yarn test to make sure you didn't break anything
• Add or update any needed documentation to the repo
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

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Project	Deployment	Actions	Updated (UTC)
mobilitydatabase-web	Ready	Preview, Comment	Apr 30, 2026 1:26pm

[github-actions]

*Lighthouse ran on https://mobilitydatabase-dj3nd04jk-mobility-data.vercel.app/ * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟢 100	🟢 94	🟢 96	🟢 100

*Lighthouse ran on https://mobilitydatabase-dj3nd04jk-mobility-data.vercel.app/feeds * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟠 83	🟠 87	🟢 96	🟢 100

*Lighthouse ran on https://mobilitydatabase-dj3nd04jk-mobility-data.vercel.app/feeds/gtfs/mdb-2126 * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟠 59	🟢 94	🟢 96	🟢 100

*Lighthouse ran on https://mobilitydatabase-dj3nd04jk-mobility-data.vercel.app/feeds/gtfs_rt/mdb-2585 * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟢 100	🟠 84	🟢 96	🟢 100

*Lighthouse ran on https://mobilitydatabase-dj3nd04jk-mobility-data.vercel.app/feeds/gbfs/gbfs-flamingo_porirua * (Desktop)
⚡️ HTML Report Lighthouse report for the changes in this PR:

Performance	Accessibility	Best Practices	SEO
🟢 99	🟢 94	🟢 96	🟢 100