Raci/ci e2e setup prewarm

[racitores]

Description

Summary

• Adds a setup-env-android / setup-env-ios job to both regression workflows that runs before all shards start
• This pre-warm job calls setup-e2e-env (without AVD/simulator or keystore) once, populating the Yarn, Foundry, Bundler, and CocoaPods caches
• All shard jobs gain a needs: [..., setup-env-{platform}] dependency so they always hit a warm cache instead of each runner independently downloading and installing the same dependencies
• For iOS, the detox build-framework-cache step is also moved into the pre-warm job so it runs exactly once across the whole workflow instead of being duplicated per shard

Motivation

Each shard in the regression suite was running the full setup-e2e-env action independently — meaning Yarn install, Foundry, Bundler, CocoaPods, and the Detox framework build were all duplicated N times (up to 4×) in parallel. Since GitHub Actions cache is shared across jobs in the same workflow run, a single pre-warm job can fill those caches before shards start, making each shard's setup near-instant on cache restore.

What's not changed

Smoke test workflows are intentionally left untouched. Their per-job if: conditions mean an unconditional pre-warm job would waste a full runner spin-up whenever only a subset of suites is selected.

Test plan

• Trigger the Android E2E Regression workflow manually and verify setup-env-android completes before shards start
• Confirm shards show cache hits for Yarn and Foundry in their setup step logs
• Trigger the iOS E2E Regression workflow manually and verify setup-env-ios completes the Detox framework build once
• Confirm iOS shards skip the detox build-framework-cache step (it no longer exists in run-e2e-workflow.yml for regression) and hit cache on CocoaPods/Bundler
• Verify no regression in test results compared to a previous run

Changelog

CHANGELOG entry:

Related issues

Fixes:

Manual testing steps

Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]

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.

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[github-actions]

🔍 Smart E2E Test Selection

⏭️ Smart E2E selection skipped - skip-smart-e2e-selection label found

All E2E tests pre-selected.

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