Linux_android_emu_vulkan_stable android_engine_vulkan_tests is 2.04% flaky

The post-submit test builder `Linux_android_emu_vulkan_stable android_engine_vulkan_tests` had a flaky ratio 2.04% for the past (up to) 100 commits, which is above our 2.00% threshold.

One recent flaky example for a same commit: https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android_emu_vulkan_stable%20android_engine_vulkan_tests/1691
Commit: https://github.com/flutter/flutter/commit/deede5462db7a6998961b2a9cd2a8ed483437ee1

Flaky builds:
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android_emu_vulkan_stable%20android_engine_vulkan_tests/1691
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux_android_emu_vulkan_stable%20android_engine_vulkan_tests/1658

Recent test runs:
https://flutter-dashboard.appspot.com/#/build?taskFilter=Linux_android_emu_vulkan_stable%20android_engine_vulkan_tests

Please follow https://github.com/flutter/flutter/blob/master/docs/infra/Reducing-Test-Flakiness.md#fixing-flaky-tests to fix the flakiness and enable the test back after validating the fix (internal dashboard to validate: go/flutter_test_flakiness).