test: Mark flaky tests with `run_alone` to reduce CI failures #257

Job	Run time
PR title check	3s
Code checks / Actions lint check	31s
Code checks / Spell check	6s
Doc checks / Doc checks / Docs check	1m 39s
Code checks / Lint check / Lint check (3.11)	31s
Code checks / Lint check / Lint check (3.14)	26s
Code checks / Lint check / Lint check (3.10)	26s
Code checks / Lint check / Lint check (3.12)	30s
Code checks / Type check / Type check (3.10)	27s
Code checks / Type check / Type check (3.11)	27s
Code checks / Type check / Type check (3.12)	30s
Code checks / Type check / Type check (3.14)	27s
Code checks / Type check / Type check (3.13)	30s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 29s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 17s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	4m 48s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	4m 57s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 23s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	6m 57s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	8m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	5m 42s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 31s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 51s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 32s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	8m 48s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	6m 33s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	6m 21s
Code checks / Lint check / Lint check (3.13)	25s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	6m 18s
	1h 34m 25s

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