QVAC-16525 infra: add iOS CI build and Device Farm test workflow (SDK)

[lauripiisang]

🎯 What problem does this PR solve?

• iOS builds for the SDK test consumer had no CI path — build:consumer:ios failed due to missing signing, and Device Farm execution was not wired up
• The existing test-sdk.yml had a commented-out ios-tests job referencing a workflow that didn't exist

📝 How does it solve it?

• New reusable workflow test-ios-sdk.yml mirroring the Android workflow structure:
  • build job (macos-14): sets up keychain/signing creds, runs qvac-test build:consumer:ios with QVAC_IOS_BUNDLE_ID override to match existing provisioning profile (io.tether.test.qvac), archives and exports IPA
  • device-farm job: uploads IPA to Device Farm, launches via Appium + XCUITest, streams app logs via pymobiledevice3 syslog live, detects consumer shutdown for early exit
  • run-producer job: identical to Android (MQTT-based, platform-agnostic)
  • cleanup job: stops Device Farm runs, downloads Customer Artifacts, uploads as GitHub Actions artifact
• Device Farm console link surfaced in GitHub Actions job summary (both iOS and Android)
• Reorganized Device Farm files into packages/sdk/tests-qvac/device-farm/ directory (renamed from flat device-farm-* files)
• Updated test-sdk.yml to wire ios-tests job (targets: ios, mobile, all)
• Updated test-android-sdk.yml references for the new file paths + added job summary link

🧪 How was it tested?

• Multiple CI runs on test-sdk.yml with targets: ios
• Verified IPA build, Device Farm upload, app launch on iPhone 16 Pro (iOS 26)
• Confirmed pymobiledevice3 syslog capture works for React Native console.log output (routed via os_log at DEBUG level, invisible to Appium's syslog_relay)
• Confirmed log collect fallback extracts logs from unified logging archive
• Android workflow verified unaffected by file renames

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ✅ (1/1)
- 1 Team Lead OR Management approval ✅ (1/1)



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*This comment is automatically updated when reviews change.*

[lauripiisang]

/review