PiT 25.2: FlowViewIT setupTest timeout too tight in parallel runs

[manolo]

Summary

FlowViewIT.setupTest waits up to 60s for the vaadin-vertical-layout
element after login, which is too tight when running with
testsInParallel=2 on CI. In PiT 25.2.0-alpha8 PROD with Vaadin 25.1.5,
1 of 5 tests failed with TimeoutError: Timeout 60000ms exceeded. The
app started in under 5s and the other 4 tests passed, which points to
flaky timing rather than a real defect.

Context

• Failing job: https://github.com/vaadin/platform/actions/runs/26274071737/job/77338335554
• Failing test: FlowViewIT.userEntersNameAndClicksButton (took 61.67s)
• Wait location: FlowViewIT.java:39 on locator("vaadin-vertical-layout")

Suggested fix

One of:

1. Increase setTimeout(60000) to setTimeout(120000) in FlowViewIT.java:40
2. Use a more specific selector (e.g. the "Your name" vaadin-text-field) and keep a tighter timeout
3. Wait for the form to be interactive instead of the layout container

PiT workaround already in place (bumped to 120s): vaadin/platform-in-test-script@0262fec