Flaky example testing in CI

[alice-i-cecile]

          Build failed (retrying...):

• run-examples

Originally posted by @bors[bot] in #7423 (comment)

@mockersf and I think there's a system that's exiting the window that has a critical system order ambiguity. Hence why it only sometimes fails.

[mockersf]

command to run the example as in CI:

CI_TESTING_CONFIG=.github/example-run/alien_cake_addict.ron cargo run --example alien_cake_addict --features "bevy_ci_testing,trace,trace_chrome"

I couldn't reproduce on macOS, the issue happened on Linux in CI. It seems it didn't happen in CI in the last few runs

[alice-i-cecile]

Closing unless / until we reproduce.