fix missing aria-label

[jshawl]

Description

This PR is a follow up to #2169 (29a18ec) that introduced an issue related to the correct content not being available.

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

If some content is available, but not the correct content, the aria-label goes missing because labelText is undefined.

Additionally, the tests in style.js were silently passing because done was not passed to it() and the test reported a success before the button rendered.

Reproduction Steps

Visit https://developer.paypal.com/demo/checkout/#/pattern/server and update the sdk script url to include a locale that does not have corresponding content:

<script src="https://www.paypal.com/sdk/js?client-id=test&currency=USD&locale=en_GB"></script>

Then, add a style property with a label property:

paypal.Buttons({
  style: {
    label: 'pay'           
  },
  createOrder: ...

Observe that there is no aria-label on the .paypal-button element

Screenshots

❤️ Thank you!

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10 ⚠️

Comparison is base (29a18ec) 51.58% compared to head (5b09b3a) 51.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2190      +/-   ##
==========================================
- Coverage   51.58%   51.48%   -0.10%     
==========================================
  Files         101      104       +3     
  Lines        1983     2014      +31     
  Branches      582      586       +4     
==========================================
+ Hits         1023     1037      +14     
- Misses        862      878      +16     
- Partials       98       99       +1     

Flag	Coverage Δ
jest	31.95% <100.00%> (+0.14%)	⬆️
karma	50.21% <0.00%> (-0.13%)	⬇️

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

Impacted Files	Coverage Δ
src/funding/paypal/config.jsx	83.33% <100.00%> (+25.00%)	⬆️

... and 6 files with indirect coverage changes

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