chore: Move chrome tests off of browserstack, add firefox

[robbie-c]

Changes

We can run chrome on the actions runner without needing to use browserstack. This means that we only use 2 of our 5 browserstack concurrent tests per PR rather than 3, which lets us have 2 PRs running tests in parallel.

I also added headless firefox because why not.

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Aug 19, 2024 5:09pm

[github-actions]

Size Change: 0 B

Total Size: 1.17 MB

ℹ️ View Unchanged

Filename	Size
dist/array.full.js	333 kB
dist/array.js	154 kB
dist/exception-autocapture.js	10.4 kB
dist/main.js	155 kB
dist/module.js	154 kB
dist/recorder-v2.js	110 kB
dist/recorder.js	110 kB
dist/surveys-preview.js	59.8 kB
dist/surveys.js	66 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	5.79 kB

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[pauldambra]

🦾 love it

(can make the firefox job required after this too?)

[robbie-c]

I don't have powers to do that but if you do then please go ahead :)

[pauldambra]

ugh, i don't any more :/