Repair wp/7.1 branch Actions: Fix flaky interactivity router navigate e2e test

[desrosj]

Part of #82781.

What?

Makes the "should update the HTML only for the latest navigation" test in test/e2e/specs/interactivity/router-navigate.spec.ts wait until the browser has requested both linked pages before letting either request through.

Why?

The test holds each page request in a page.route() handler, and the functions that let a request through (resolveLink1 and resolveLink2) are only assigned once those handlers run. The test only waited for the page's own navigation counter, which can reach 2 before Playwright has run the handlers, so calling resolveLink2() could fail with TypeError: resolveLink2 is not a function. It hasn't been seen failing on this stack, but this branch has the same test, so the fix is included for consistency.

Upstream

A straight cherry-pick of e693c18 (#80178) from trunk.

Use of AI Tools

This PR was created by Claude Code under my supervision. All code should be treated as AI-produced and not yet reviewed by a human until this PR is marked Ready for Review.

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🤖 PR meta 🤖

📦 Bundle size

Size Change: 0 B

Total Size: 7.75 MB

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🏁 Flaky tests

Show the failures

Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

should paste block styles using keyboard in /test/e2e/specs/editor/various/list-view.spec.js, passed after 1 failed attempt.

Error: expect(received).toMatchObject(expected)

- Expected  - 6
+ Received  + 0

@@ -1,15 +1,9 @@
  Array [
    Object {
      "attributes": Object {
        "content": "First Block",
-       "style": Object {
-         "color": Object {
-           "background": "#00ff00",
-           "text": "#ff0000",
-         },
-       },
      },
      "name": "core/paragraph",
    },
    Object {
      "attributes": Object {

Call Log:
- Timeout 5000ms exceeded while waiting on the predicate
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/various/list-view.spec.js:653:41

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