Separate HtmlBlockMixin base to use in About, StaticTab, CourseInfo

[salman2013]

Description:
Use extracted HTML block base for About, StaticTab, CourseInfo

Ticket: openedx/openedx-platform#37718 (comment)

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[farhan]

1 query, rest all seems good.
Feel free to merge after looking into it.

[farhan]

Which abstract method making this class abstract?

[salman2013]

The studio_view method in HtmlBlockMixin just raises NotImplementedError (line 274), so pylint treats it as abstract. to resolve this ignore it.