[E2E] Stabilize flaky specs and helpers

[mgascam]

Fixes #WOOPMNT-5304 (sub-issue of WOOPMNT-5249)

Changes proposed in this Pull Request

Split from #11002 (comment) to focus on fixing flaky e2e tests.

Testing instructions

• Automated tests should pass in CI, like in the following runs:
  • https://github.com/Automattic/woocommerce-payments/actions/runs/17469816108
  • https://github.com/Automattic/woocommerce-payments/actions/runs/17469809331

---

• Run npm run changelog to add a changelog file, choose patch to leave it empty if the change is not significant. You can add multiple changelog files in one PR by running this command a few times.
• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

Post merge

• Link to testing instructions from release testing doc following these instructions : Add link here / 'QA Testing Not Applicable'
• Add or update critical flows and testing instructions for critical flows, if applicable.
• Add what's changed (description, screenshot, demo videos etc.) to the release announcement post, if applicable.

[botwoo]

Test the build

Option 1. Jetpack Beta

• Install and activate Jetpack Beta.
• Use this build by searching for PR number 11036 or branch name dev/woopmnt-5249-e2e-fixes in your-test.site/wp-admin/admin.php?page=jetpack-beta&plugin=woocommerce-payments

Option 2. Jurassic Ninja - available for logged-in A12s

🚀 Launch a JN site with this branch 🚀

ℹ️ Install this Tampermonkey script to get more options.

---

Build info:

• Latest commit: c3d0b80
• Build time: 2025-09-08 03:44:43 UTC

Note: the build is updated when a new commit is pushed to this PR.

[github-actions]

Size Change: 0 B

Total Size: 871 kB

ℹ️ View Unchanged

Filename	Size
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release/woocommerce-payments/assets/css/admin.rtl.css	1.45 kB
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release/woocommerce-payments/dist/blocks-checkout.js	54.3 kB
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release/woocommerce-payments/dist/settings.js	140 kB
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release/woocommerce-payments/dist/subscription-product-onboarding-modal-rtl.css	527 B
release/woocommerce-payments/dist/subscription-product-onboarding-modal.css	527 B
release/woocommerce-payments/dist/subscription-product-onboarding-modal.js	1.98 kB
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release/woocommerce-payments/dist/tos.js	3 kB
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_{compressed-size-action}

[htdat]

Other changes look good but IMHO, the changes for dispute should be in its own PR.

[htdat]

Thanks for porting dispute changes to a separate PR.

LGTM now.