Description

• Simplify Metro OAuth module mocks use one variable, isE2E or E2E_MOCK_OAUTH=true at bundle time.
• Removes unused Metro env flags.

Changelog

CHANGELOG entry: null

Related issues

Fixes:

Manual testing steps

Feature: Metro OAuth mocks for E2E/perf bundles

 Scenario: Production bundle without E2E mock flags
    Given Metro runs with IS_TEST not "true", METAMASK_ENVIRONMENT not "e2e", and E2E_MOCK_OAUTH not "true"
    When the app bundle is produced
    Then seedless-onboarding-controller and OAuthLoginHandlers resolve to real modules 
 
 Scenario: E2E bundle
    Given Metro runs with IS_TEST="true" or METAMASK_ENVIRONMENT="e2e"
    When the app bundle is produced
    Then seedless-onboarding-controller and OAuthLoginHandlers can resolve to tests/module-mocking implementations

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I've included tests if applicable
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Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
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