harmonize desktop payment smoke tests

[atavism]

Builds on #8939 by incorporating the reusable payment-test structure and CI improvements from @jigar-f’s #8960 while preserving the staging E2E conversion flow.

• Adds a reusable payment robot for Stripe rendering and conversion tests.
• Improves state-based checkout tracking and desktop test readiness.
• Prevents the macOS smoke script from deleting app data outside CI.
• Captures Windows payment logs for easier failure diagnosis.

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[Copilot]

Pull request overview

Aligns the desktop payment smoke tests with the newer reusable “robot” structure and CI diagnostics, while keeping the staging E2E conversion flow intact for Windows/macOS smoke coverage.

Changes:

• Introduces a reusable PaymentRobot to drive plan loading, plan selection, and checkout initiation through app state/providers.
• Refactors the desktop Stripe checkout smoke test to use AppRobot/PaymentRobot and stateful WebView trackers for clearer readiness/failure reporting.
• Hardens CI workflows/scripts: prevent macOS smoke script from wiping local data outside CI and upload Windows payment smoke logs as artifacts.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
integration_test/utils/payment_robot.dart	New reusable helper for plans + payment-method navigation and starting checkout flows.
integration_test/utils/app_robot.dart	Extends app-level robot for desktop readiness by dismissing macOS extension prompt during waits.
integration_test/payment/desktop_stripe_checkout_smoke_test.dart	Refactors smoke test to use robots and stateful WebView trackers; improves logging and run ID/email helpers.
.github/workflows/build-windows.yml	Uploads Windows payment smoke logs as an artifact for post-failure diagnosis.
.github/scripts/macos_payment_checkout_smoke.sh	Refuses to run outside CI to prevent accidental data deletion; uses marker file for staging selection and removes dart-define env override.

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