Improvements for "Render GFM Mermaid diagrams in a sandboxed iframe"

This issue should list down all possible improvements for sandboxing work related to mermaid diagrams.

Follow-up tasks

The following discussions from !76470 (merged), !74414 (merged) should be addressed:

• Add meta tags - discussion

• Performance Improvement - discussion

• Improve test coverage - discussion

• Fix CSP issue for rspec

  It's currently blocked due to CSP issue

  

• jquery removal - #349779 (closed)

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