ci: migrate Instrumentation tests to ubuntu-latest with KVM + AVD cache

Move the required `Instrumentation tests` job off the flaky `macos-15-intel`
runner. KVM-accelerated `ubuntu-latest` is the official `android-emulator-runner`
recommendation, runs ~3x faster, and is dramatically more stable than the
deprecating Intel mac fleet that has been failing this required check on
master.

- Bump `reactivecircus/android-emulator-runner` v2.30.1 -> v2.34.0
- Switch to API 29 x86_64 (better-supported image than legacy API 28 x86)
- Add AVD cache + warm-up step to cut cold-start time
- Pin all action SHAs

Author: joaodordio

.github/workflows/build.yml

@@ -60,8 +60,14 @@ jobs:
 
   instrumentation-tests:
     name: Instrumentation tests
-    runs-on: macos-15-intel
+    runs-on: ubuntu-latest
     steps:
+      - name: Enable KVM
+        run: |
+          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+          sudo udevadm control --reload-rules
+          sudo udevadm trigger --name-match=kvm
+
       - name: Checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
@@ -75,10 +81,34 @@ jobs:
 
       - run: touch local.properties
 
+      - name: AVD cache
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        id: avd-cache
+        with:
+          path: |
+            ~/.android/avd/*
+            ~/.android/adb*
+          key: avd-29-x86_64-v1
+
+      - name: Create AVD snapshot
+        if: steps.avd-cache.outputs.cache-hit != 'true'
+        uses: reactivecircus/android-emulator-runner@324029e2f414c084d8b15ba075288885e74aef9c # v2.34.0
+        with:
+          api-level: 29
+          arch: x86_64
+          force-avd-creation: false
+          emulator-options: -no-window -gpu swiftshader_indirect -no-snapshot -noaudio -no-boot-anim
+          disable-animations: false
+          script: echo "Generated AVD snapshot."
+
       - name: Test
-        uses: reactivecircus/android-emulator-runner@6b0df4b0efb23bb0ec63d881db79aefbc976e4b2 # v2.30.1
+        uses: reactivecircus/android-emulator-runner@324029e2f414c084d8b15ba075288885e74aef9c # v2.34.0
         with:
-          api-level: 28
+          api-level: 29
+          arch: x86_64
+          force-avd-creation: false
+          emulator-options: -no-window -gpu swiftshader_indirect -no-snapshot -noaudio -no-boot-anim
+          disable-animations: true
           script: ./gradlew :iterableapi:connectedCheck
 
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