test: Fix flaky `*_collection_iterate` tests with polling helper #709

Job	Run time
PR title check	5s
Checks / Spell check	9s
Checks / Actions lint check	41s
Checks / Doc check / Docs check	1m 17s
Checks / Type check / Type check (3.11)	10s
Checks / Lint check / Lint check (3.11)	13s
Checks / Type check / Type check (3.12)	11s
Checks / Integration tests (3.14, ubuntu-latest)	2m 26s
Checks / Docstrings check	16s
Checks / Lint check / Lint check (3.14)	12s
Checks / Package check	22s
Checks / Type check / Type check (3.13)	10s
Checks / Lint check / Lint check (3.13)	11s
Checks / Type check / Type check (3.14)	10s
Checks / Integration tests (3.11, ubuntu-latest)	2m 19s
Checks / Lint check / Lint check (3.12)	12s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	49s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	49s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	46s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	1m 8s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	1m 10s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	1m 12s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	1m 5s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	42s
	16m 45s

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