fix(ci): Pin Android E2E emulator to build 15679343 (37.1.5.0) (#6378)

Canary emulator 37.1.6.0 (build 15726199) broke emulator networking,
causing the full "Test android production REV2" suite to fail: the
Spaceflight external fetch and the 10.0.2.2 mock-server path both lose
egress, so every envelope test times out. The OS image, system image,
and SDK code are unchanged between the last green run and the failures;
the only difference is the canary emulator binary version.

Pin to the last known-good build until a fixed canary emulator ships.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: antonis

.github/workflows/sample-application.yml

@@ -439,6 +439,11 @@ jobs:
         uses: reactivecircus/android-emulator-runner@e89f39f1abbbd05b1113a29cf4db69e7540cae5a # pin@v2.37.0
         with:
           api-level: ${{ env.ANDROID_API_LEVEL }}
+          # Pin the emulator binary: canary 37.1.6.0 (build 15726199) broke emulator
+          # networking (no egress to 10.0.2.2 mock server or external internet), which
+          # makes the whole E2E suite time out. 37.1.5.0 (build 15679343) is the last
+          # known-good build. Remove once a fixed canary emulator ships.
+          emulator-build: 15679343
           force-avd-creation: false
           disable-animations: true
           disable-spellchecker: true