perf: reuse progressive live snapshot during hydration (Closes #1405)

tests/e2e/test_mobile_home_bootstrap_release.py

@@ -186,6 +186,7 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
             page.goto(origin + "/", wait_until="networkidle")
             page.locator('input[name="device_label"]').fill("Home bootstrap release phone")
             page.locator('input[name="access_token"]').fill(ACCESS_TOKEN)
+            live_requests.clear()
             page.locator("#submit-sign-in").click()
             page.wait_for_url(origin + "/", wait_until="networkidle")
             assert launch_transfer_events.index("workspace-requested") < (
@@ -193,6 +194,8 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
             ), launch_transfer_events
 
             expect(page.locator("#my-work-status")).to_contain_text("2")
+            revisionless_live_requests = [url for url in live_requests if "?" not in url]
+            assert len(revisionless_live_requests) == 1, live_requests
             initial_live_requests = len(live_requests)
             page.evaluate(
                 """