add label for pay now or later

[delbarrow]

Description

Display a new cobranded Buy Now Pay Later label on the PayPal button when the merchant is eligible for Pay Later and the experiment is enabled. This label is unique to the PayPal button and is separate from the existing standalone Pay Later button.

Why are we making these changes? Include references to any related Jira tasks or GitHub Issues

Ticket: DTPPCPSDK-5700

Reproduction Steps (if applicable)

1. Render the paypal button with paylater eligibility
2. New "Pay Now or Later" label should display if no other label than just the 'paypal' label is selected.
3. Label should render on smart stack as well

Screenshots (if applicable)

Dependent Changes (if applicable)

Groups who should review (if applicable)

❤️ Thank you!

[codecov]

Codecov Report

❌ Patch coverage is 70.58824% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.44%. Comparing base (a1c952c) to head (4c4ae6e).
⚠️ Report is 91 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ui/buttons/props.js	77.77%	2 Missing ⚠️
src/funding/content.jsx	0.00%	1 Missing ⚠️
src/funding/paypal/template.jsx	75.00%	1 Missing ⚠️
src/ui/buttons/button.jsx	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2600      +/-   ##
==========================================
- Coverage   54.51%   53.44%   -1.08%     
==========================================
  Files         162      110      -52     
  Lines       16365     2758   -13607     
  Branches     1083      933     -150     
==========================================
- Hits         8922     1474    -7448     
+ Misses       7330     1150    -6180     
- Partials      113      134      +21     

Flag	Coverage Δ
jest	29.06% <70.58%> (+1.57%)	⬆️
karma	56.28% <61.53%> (+0.62%)	⬆️
vitest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.