Feature: add support for Stripe Payment Element in donor dashboard

[jonwaldstein]

Resolves GIVE-916

Depends on https://github.com/impress-org/give-recurring/pull/1231

Description

This adds StripePaymentElement support to the donor dashboard using a billing portal link. This will ensure its possible for a donor with a subscription to update their payment method within the donor dashboard.

Affects

• The Donor Dashboard + Stripe Payment Element

Visuals

Screen.Recording.2025-06-27.at.5.31.42.PM.2.1.mov

Testing Instructions

ZIP: https://github.com/impress-org/givewp/actions/runs/20066983359
Recurring PR: https://github.com/impress-org/give-recurring/pull/1231

• Install this PR zip and the recurring counterpart
• Create a subscription using Stripe Payment Element
• Visit the donor dashboard, find the subscription and click manage subscription
• You should see a link to "Open billing portal"
• Click that link and update your payment method

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Relevant @unreleased tags included in DocBlocks
• Includes unit tests
• Reviewed by the designer (if follows a design)
• Self Review of code and UX completed

[glaubersilva]

@jonwaldstein Nice work! Ready to QA. 🚀