Fix flaky test [chromium] _ e2e/org-switcher.spec.ts:184:1 _ a second tab is refused after a switch: by the broadcast, and by the API when there is none (AC8)

The merge lane saw `[chromium] _ e2e/org-switcher.spec.ts:184:1 _ a second tab is refused after a switch: by the broadcast, and by the API when there is none (AC8)` fail and then pass on a rerun of the same tree. - Test: `[chromium] _ e2e/org-switcher.spec.ts:184:1 _ a second tab is refused after a switch: by the broadcast, and by the API when there is none (AC8)` - Tree: `917f1f5fe03a5c4c764de66c47626d30ff030b90` - Lane task: 9550 - Flake record: 01a16b9f-9951-7016-ad74-7812d25cd1ab Make it deterministic; do not delete it unless it tests nothing.

Deflaked org-switcher AC8: tab 2's collector now stops before the switch back, after which 200s as home are correct. Lane failure reproduced deterministically, then fixed (8/8 repeats green). Quick gate green; PR #6790 queued. No UI surface affected. Memory: none applied.