test: Fix flaky event manager tests by replacing sleep with wait #432

Job	Run time
PR title check	3s
Code checks / Actions lint check	32s
Doc checks / Doc checks / Docs check	1m 54s
Code checks / Spell check	6s
Code checks / Lint check / Lint check (3.13)	30s
Code checks / Lint check / Lint check (3.12)	31s
Code checks / Lint check / Lint check (3.10)	31s
Code checks / Lint check / Lint check (3.14)	31s
Code checks / Lint check / Lint check (3.11)	23s
Code checks / Type check / Type check (3.10)	25s
Code checks / Type check / Type check (3.11)	29s
Code checks / Type check / Type check (3.14)	32s
Code checks / Type check / Type check (3.13)	26s
Code checks / Type check / Type check (3.12)	33s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	6m 37s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 32s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	6m 12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 54s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	7m 15s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 28s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 55s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 1s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	4m 6s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 49s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	7m 29s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	5m 43s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	7m 8s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 12s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	5m 23s
	1h 35m 10s

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