`events_test.dart` is flaky

[elliette]

See: https://github.com/dart-lang/webdev/actions/runs/5752276393/job/15593002960

[bkonyi]

This test likely started failing when DevTools started displaying the home page instead of the debugger page by default. We should probably be looking for different events that reference the home page being opened instead.

[jyameo]

Related issue with more details: #2394

[jyameo]

Will close this as this issue is being tracked in #2394