fix isHeadless usage in MMI Dockerfile

[legobeat]

Description

• Restore parsing of HEADLESS and PLAYWRIGHT_HEADLESS env vars
  • See chore(refactor:test): unify environment variables for setting headless modes #24499
• Copy env.ts into MMI E2E oci image to make parsing work in this context

Related issues

• Targeting: chore: update channel for contact MMI team and CircleCI step #25247

Manual testing steps

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension 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]

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[zone-live]

@legobeat I've added these changes in my PR as well. Feel free to close this one 👍🏼