test: Fix flaky `is_finished` checks in shared RQ integration tests #269

Job	Run time
PR title check	4s
Code checks / Actions lint check	30s
Code checks / Spell check	5s
Tests / Integration tests (3.10, ubuntu-latest)	3m 3s
Tests / E2E tests (3.14, ubuntu-latest)	4m 56s
Tests / E2E tests (3.10, ubuntu-latest)	4m 34s
Tests / Integration tests (3.14, ubuntu-latest)	3m 5s
Doc checks / Doc checks / Docs check	1m 6s
Code checks / Lint check / Lint check (3.12)	16s
Code checks / Lint check / Lint check (3.11)	12s
Code checks / Lint check / Lint check (3.14)	12s
Code checks / Lint check / Lint check (3.10)	17s
Code checks / Type check / Type check (3.10)	14s
Code checks / Lint check / Lint check (3.13)	16s
Code checks / Type check / Type check (3.12)	9s
Code checks / Type check / Type check (3.14)	12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	55s
Code checks / Type check / Type check (3.11)	15s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 37s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 34s
Code checks / Type check / Type check (3.13)	12s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	1m 4s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 24s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	59s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 35s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	1m 24s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	1m 3s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	57s
	32m 10s

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