test(functional): disable flaky vpn integration spec via test.fixme

[vbudhram]

Because

• The vpn integration "authorization flow - user already signed into Firefox" test fails intermittently in CI on the cached-signin click, blocking unrelated PRs.

This pull request

• Marks the single test in tests/misc/vpnIntegration.spec.ts with test.fixme so Playwright reports it as expected-failing and the pipeline stays green while the root cause is investigated on a separate branch.

Issue that this pull request solves

Closes: (issue number)

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• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).
• I have manually reviewed all AI generated code.

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[Copilot]

Pull request overview

This PR disables a flaky VPN integration Playwright test so it no longer blocks CI while the cached sign-in/WebChannel race is investigated.

Changes:

• Converts the VPN authorization-flow test to test.fixme.
• Adds a short comment explaining that the disablement is due to a cached-signin to WebChannel race.

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[LZoog]

Dan has the fix for this in #20543 and it's been approved so not sure we want to disable this?

[vbudhram]

Dan has the fix for this in #20543 and it's been approved so not sure we want to disable this?

@LZoog from meeting he said he was playing wackamole because it was introducing other test failures and I recommend we just disable it until we can figure it out.

[vpomerleau]

Agree, let's disable this until the fix is ready.