HOG-514: Boost Dashboard: Add "Learn more" doc links to module descriptions and Overall Score tooltip

[LiamSarsfield]

Fixes https://linear.app/a8c/issue/HOG-514/boost-dashboard-surface-score-breakdown-hints-and-add-learn-more-doc

Proposed changes

Add "Learn more" documentation links to the Boost dashboard module descriptions and the Overall Score tooltip. This gives users a path to relevant support documentation directly from the dashboard UI.

• Overall Score tooltip — Added a "Learn more about how your speed score is measured" link pointing to the speed measurement docs.
• Optimize CSS Loading (both manual and automatic modules) — Added a "Learn more" link to the Critical CSS troubleshooting docs.
• Cache Site Pages — Added a "Learn more" link to the caching troubleshooting docs.
• Defer Non-Essential JavaScript — Added a "Learn more" link to the JS deferral exclusion docs (alongside the existing web.dev link).
• Image CDN — Added a "Learn more" link to the main Jetpack Boost docs.
• Concatenate JS / Concatenate CSS — Added a "Learn more" link to the concatenation troubleshooting docs.

URL mappings follow the specification in the Linear issue.

Related product discussion/links

• HOG-514

Does this pull request change what data or activity we track or use?

No.

Testing instructions

• Go to the Jetpack Boost settings page in wp-admin.
• Verify each module description now includes a "Learn more" link that opens the correct documentation page in a new tab:
  • Overall Score tooltip → https://jetpack.com/support/jetpack-boost/how-speed-is-measured/
  • Optimize CSS Loading → https://jetpack.com/support/jetpack-boost/troubleshooting-critical-css-issues/
  • Cache Site Pages → https://jetpack.com/support/jetpack-boost/troubleshooting-caching-issues/
  • Defer Non-Essential JavaScript → https://jetpack.com/support/jetpack-boost/exclude-javascript-files-from-jetpack-boost-deferral/
  • Image CDN → https://jetpack.com/support/jetpack-boost/
  • Concatenate JS → https://jetpack.com/support/jetpack-boost/troubleshooting-concatenated-css-or-javascript-delivery-methods/
  • Concatenate CSS → https://jetpack.com/support/jetpack-boost/troubleshooting-concatenated-css-or-javascript-delivery-methods/
• Verify all links open in a new tab.

Verification

• Lint: PASS
• Tests: PASS (24/24)
• Diff review: PASS — confirmed no unintended changes

Confidence

HIGH — Straightforward UI-only change adding documentation links using existing createInterpolateElement + Link patterns already established in the codebase. All tests pass, lint clean.

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This PR was created autonomously by linear-solver.
Triage complexity: simple | Linear issue

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Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

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