chore: add cache to static pages in app router

[hbjORbj]

What does this PR do?

• None of the pages we migrated so far in App Router are static pages, so this won't affect any pages in Production
• But I am gonna start migrating static pages, so this logic is needed to have static pages properly cached (better perf)

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• N/A - I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

[vercel]

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2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (12/19/24)

1 reviewer was added to this PR based on Keith Williams's automation.

[github-actions]

E2E results are ready!

• Workflow #41975.1 latest results