Add blob snippet embed support to content editor

What does this MR do and why?

Adds content editor support for the blob snippet embeds.

This is a must have for this feature, and the reason why the previous MR added an FF: without it, they become atrociously corrupted in the rich-text editor, which then will actually get saved out and look that bad For Real™ if the user continues.

MR stack

For Render blob line of code in GFM (#300855):

Screenshots or screen recordings

Using the same example as !246838:

Before After
image image.png

How to set up and validate locally

TODO

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Asherah Connor

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