fix(ci): limit Playwright concurrency

[rsarika]

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[chatgpt-codex-connector]

Update the Playwright concurrency documentation

This replaces the five parallel OAuth set groups with one globally batched queue, while playwright/README.md:203-209 still describes the removed grouping behavior; the README also says workers always scale to USER_SETS.length at lines 216 and 261 despite the new four-worker CI cap. Update those standing instructions in this change so operators do not diagnose or size E2E runs using obsolete concurrency behavior.

AGENTS.md reference: AGENTS.md:L68-L68

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