Add mobile environments and few improvements

[hcho112]

This PR contains following changes:

1. Added two mobile environments to be tested
2. Delete firebase accounts created from auth spec

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Name	Status	Preview	Comments	Updated (UTC)
fast-auth-signer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 31, 2024 11:19am

[hcho112]

This branch has been outdated and will be replaced by /e2e-mobile-env-2