Fix: Taxonomy label were encoded in Instant Results

[burhandodhy]

Description of the Change

This PR fixes an issue where special characters in taxonomy labels were displayed as encoded HTML instead of rendering correctly.

Closes #4271

How to test the Change

Register a taxonomy with Special Character within the label, like esc_html__( 'Check & Radio', 'elasticpress' )

Changelog Entry

Fixed - Instant Results displayed special characters as HTML encoded text.

Credits

Props @burhandodhy @wparslans

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[wparslans]

Awesome @burhandodhy
I have tested it with a category which contains ' and "

Although it doesn't work in this case, as by default wp_specialchars_decode has ENT_NOQUOTES it should be set to ENT_QUOTES to deal with qoutes.