Allow some HTML in product / option / shipping field labels

[jakejackson1]

Description

Updates the Product table to allow some HTML in the field and choices labels.

For legacy reasons, $form_data auto-escapes HTML. To display HTML in field labels we need to unescape the info first, and then run it through wp_kses_post().

Testing instructions

1. Add Product, Option, and Shipping fields to a form
2. Include HTML in the label and option values
3. Submit the form
4. View a Core PDF
5. Ensure the text is formatted correctly

Screenshots

Checklist:

• [x] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (cd270c0) 75.13% compared to head (059ed62) 75.13%.

Files	Patch %	Lines
src/Helper/Fields/Field_Products.php	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #1485 +/- ## ============================================== Coverage 75.13% 75.13% Complexity 2953 2953 ============================================== Files 243 243 Lines 12882 12882 Branches 370 370 ============================================== Hits 9679 9679 Misses 3195 3195 Partials 8 8 ```

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[jakejackson1]

Notify https://secure.helpscout.net/conversation/2445795287/25696/ upon release