feat(js): Remove metrics configuration for v8

[timfish]

For v8 of the JavaScript SDKs, metrics features are supported without any additional configuration.

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 4, 2024 1:13pm

[vivianyentran]

I think we should also update the version support note () to clarify that in v8 and up, metrics works out of the box with no additional configuration required.

We should also think about how to preserve info like the configuration setup for previous versions. There will probably be users who want to keep using v7 but still want to set up metrics.

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[timfish]

Needs work

[timfish]

No longer required