add staging support

[Lawliet-Chan]

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[dghelm]

Can we please merge this into a different branch? Perhaps scroll-staging? Then I can setup netlify automations for that branch.

[dghelm]

To fix the TS error, try doing a search for SupportedChainId.SCROLL_ALPHA, and making sure you've also added SupportedChainId.SCROLL_STAGING,

A quick review: In src/constants/chains.ts L42 you'll want to give the network a name and also add the network around lines 82 and 112.