Fix: CSS fails “Ensure text remains visible during webfont load” audit by Google’s PageSpeed Insights

[2aragorn]

PR Checklist

• The commit message follows our guidelines: https://github.com/elementor/elementor/blob/master/.github/CONTRIBUTING.md

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Summary

This PR can be summarized in the following changelog entry:

• Fix failed “Ensure text remains visible during webfont load” audit by Google’s PageSpeed Insights

Description

An explanation of what is done in this PR

• Added "font-display: swap;" to relevant CSS classes.

Test instructions

This PR can be tested by following these steps:

• Use Google PageSpeed to analyze a website using Elementor. (https://pagespeed.web.dev/)
• Check the "Performance" tab
• Check the sources of the "Ensure text remains visible during webfont load" error
• One of the sources will be /wp-content/plugins/elementor/assets/lib/eicons/css/elementor-icons.css

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended
• Docs have been added / updated (for bug fixes / features)

Fixes #

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