PDJB-NONE: [EXPERIMENT] Block external analytics requests in integration tests

[Travis-Softwire]

Experiment branch — not for merge.

Measuring whether removing the external analytics request from the test critical path speeds up CI.

The layout renders <script async src="https://plausible.io/js/pa-...js"> from a hardcoded constant (PLAUSIBLE_URL), not from the configurable plausible.base-url. So every page load in every integration test makes a real external HTTPS request. Being an async script it delays the window load event, which ClickAndWaitable.clickAndWait waits for — putting an internet round trip on the critical path of every interaction. Each test gets a fresh BrowserContext, so the browser cache never helps.

This branch aborts those requests via page.route, and temporarily uploads build/test-results so each run yields per-class timings rather than one noisy wall-clock number.

Control: the reset-only branch measured 21.0 / 22.7 / 21.4 min (mean 21.7) for the gradle check step over three runs of identical code.