Allow late loading of MathJax bundle

[philippjfr]

Fixes #8176

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 71.42%. Comparing base (23515a0) to head (d37ad8f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/io/resources.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (23515a0) and HEAD (d37ad8f). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (23515a0)	HEAD (d37ad8f)
	8	6

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #8179       +/-   ##
===========================================
- Coverage   87.37%   71.42%   -15.96%     
===========================================
  Files         348      347        -1     
  Lines       53836    53835        -1     
===========================================
- Hits        47040    38449     -8591     
- Misses       6796    15386     +8590     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.