ci: skip Lighthouse audit when Netlify preview is not live

[ShubhamOulkar]

same as title

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[github-actions]

🚦 Lighthouse Results (Mobile & Desktop)

URL	Device	Perf	A11y	Best Practices
/	mobile	🔴 70	🟢 100	🟢 96
/en/blog/posts.html	mobile	🟠 89	🟢 96	🟢 96
/en/5x/api.html	mobile	🔴 74	🟢 95	🟢 96
/	desktop	🟢 100	🟢 100	🟢 96
/en/blog/posts.html	desktop	🟢 97	🟢 96	🟢 93
/en/5x/api.html	desktop	🟢 97	🟢 95	🟢 96

[Copilot]

Pull Request Overview

This PR improves the CI workflow by adding logic to skip Lighthouse audits when Netlify preview deployments are not available, preventing failed CI runs due to unavailable preview URLs.

• Increases retry attempts from 4 to 12 with configurable delay
• Sets environment variable to conditionally skip Lighthouse steps when preview is unavailable
• Adds conditional execution to all Lighthouse-related workflow steps

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[bjohansebas]

LGTM, sorry for the delay. I’m trying to prioritize my OSS work now that I have a new university schedule. I’ll try to review the PRs on weekends.

[ShubhamOulkar]

LGTM, sorry for the delay. I’m trying to prioritize my OSS work now that I have a new university schedule. I’ll try to review the PRs on weekends.

It is better late than nothing. I am also doing on weekends 😃