Replace CWV course link with new Optimizing Frontend Perf. course

[briannadelvalle-datadog]

What does this PR do? What is the motivation?

Replaces the link to the Core Web Vitals course with the link for the new Optimizing Frontend Performance course

Merge instructions

Merge readiness:

• Ready for merge

For Datadog employees:

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/briannadelvalle-datadog/replace-cwv-course-link/real_user_monitoring/browser/optimizing_performance/