Optimize CI workflows

[rygine]

Summary

Since the JS SDK and the MLS Client are separate packages, only run their respective workflows when their files change.

This PR also upgrades to Warp runners where possible. For some reason, there are fetch issues in some of the JS SDK tests on Warp runners so will use GitHub runners for testing.

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Latest commit: b86960a

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Deploying xmtp-js-docs with    Cloudflare Pages

Latest commit:	b86960a
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Preview URL:	https://c90adb09.xmtp-js.pages.dev
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[neekolas]

Did not know this option was a thing

[rygine]

i'm using this for the node bindings in libxmtp as well. i have some more optimizations in mind for libxmtp to help speed up the workflows using paths.