feat: add feature flag env var

[wachunei]

Description

Currently the LaunchDarkly environment are coupled with a METAMASK_ENVIRONMENT value, which is used across the app. This makes impossible to customize the LD environment for manual builds (for example, a Flask builds that points to Production LD).

This PR introduces FEATURE_FLAG_ENVIRONMENT optional env var that can be set on bitrise to set a custom LD env.

Related issues

Fixes:

Manual testing steps

1. Go to this page...

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
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

Bitrise

✅✅✅ pr_smoke_e2e_pipeline passed on Bitrise! ✅✅✅

Commit hash: 492e5a6
Build link: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/813063a8-4376-4725-93b4-e708553a1d7d

Note

• You can kick off another pr_smoke_e2e_pipeline on Bitrise by removing and re-applying the Run Smoke E2E label on the pull request

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud