Extract test accounts to env vars

[NicolasMassart]

Development & PR Process

1. Follow MetaMask Mobile Coding Standards
2. Add release-xx label to identify the PR slated for a upcoming release (will be used in release discussion)
3. Add needs-dev-review label when work is completed
4. Add needs-qa label when dev review is completed
5. Add QA Passed label when QA has signed off

Description

Extract test accounts SRP and matching addresses to ENV vars that will be provided as secrets in CI.

1. What is the reason for the change?

• test accounts are automatically drained from any test ETH as SRP is public...
  2. What is the improvement/solution?
• move infos to env vars
• setup MM_TEST_ACCOUNT_SRP and MM_TEST_ACCOUNT_ADDRESS secret vars in Bitrise (not env vars).
• test all tests are passing with the new test account

NOTE: It requires to move tokens and collectibles to this new account

Screenshots/Recordings

If applicable, add screenshots and/or recordings to visualize the before and after of your change

Issue

Progresses MetaMask/mobile-planning#672

Checklist

• There is a related GitHub issue
• Tests are included if applicable
• Any added code is fully documented

[github-actions]

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[sethkfman]

@NicolasMassart I would stub these env values out in the js.env file so people know to add them locally for e2e tests. I would also add a section in the e2e ReadMe.

[sethkfman]

LGTM