fix: use staleWhileRevalidate in caching middleware

[im-adithya]

Fixes #22131

Description

Passes staleWhileRevalidate to the cacheControl as it was missing previously, causing the above issue.

Checklist

• There's a clear use-case for this code change, explained below
• Commit message has a short title & references relevant issues
• The build will pass (run yarn test:all and yarn lint)

[coderabbitai]

Walkthrough

The pull request updates the caching middleware by modifying the parameters passed to the cache control function. The change adds the staleWhileRevalidate value, retrieved from the configuration settings, to the function calls that set cache headers for both member and public content. This adjustment ensures that the caching mechanism now includes the stale-while-revalidate directive along with the previously existing maxAge value. The overall middleware logic remains unchanged, with the enhancement solely focused on accommodating the additional caching parameter.

Assessment against linked issues

Objective	Addressed	Explanation
Set staleWhileRevalidate from configuration in cache control header (#22131)	✅

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📥 Commits

Reviewing files that changed from the base of the PR and between e87dfa2 and bbcb289.

📒 Files selected for processing (1)

• ghost/core/core/frontend/web/middleware/frontend-caching.js (1 hunks)

🔇 Additional comments (2)

ghost/core/core/frontend/web/middleware/frontend-caching.js (2)

65-68: Properly implemented staleWhileRevalidate for member content caching

The change correctly adds the staleWhileRevalidate configuration parameter to the cache control middleware. This ensures that browsers can use a stale cached response while revalidating in the background, which improves performance while maintaining content freshness.

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71-74: Consistently applied staleWhileRevalidate for public content

Good job maintaining consistency by applying the same caching configuration to both member and public content paths. This ensures uniform caching behavior throughout the application.

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[im-adithya]

@mike182uk can you please have a look :D