fix(exportModal): fix embed font css for export template

[kaminderpal]

Description

Fix the loading of font Embed in Css when we export the png from export template. Before when we try to export the png, 32 requests were sent to google to get the embed fonts. Now we will fetch the fonts from our dom.

Fixes #2290

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

Add the URL for your deploy! https://kaminderpal.github.io/geoview/demos-navigator.html?config=./configs/navigator/07-basic-appbar.json

Checklist:

• [x] I have build (rush build) and deploy (rush host) my PR
• [x] I have connected the issues(s) to this PR
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] I have created new issue(s) related to the outcome of this PR is needed
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

---

This change is