Use html block base for About, StaticTab, CourseInfo

[salman2013]

Description

In this PR i use extracted HTML block base for AboutBlock, StaticTabBlock, CourseInfoBlock

All details are mention on the ticket. Ticket: https://github.com/openedx/edx-platform/issues/37718#issuecomment-3643790126

AboutBlock Testing Scenarios

• Open CMS

• Open the target course

• Navigate to Settings -> Schedule & Details

• On the Schedule & Details Page locate the "Course summary page" section and open the url provided under this heading.

• Verify that the AboutBlock content is rendered correctly on the course summary page

• On the Schedule & Details Page locate the "Course overview section.

• Verify the content displayed under the “Course overview” section

CourseInfoBlock Testing Scenarios

Scenario # 1

• Open CMS
• Navigate to Content -> Course Updates
• Verify Course updates can be properly created and edited.
• Verify Course handouts can be properly added and modified.

Scenario # 2

• Open LMS
• Navigate to Corse tab
• Verify that course handouts are visible on the right hand side of the course page.
• Verify that course updates are display correctly under the course update section.

StaticTabBlock Testing Scenarios

• Open CMS

• Navigate to Content -> Pages & Resources

• Scroll to the Custom Page section

• Add a new custom page and save the changes

• Open LMS

• Open same course

• Verify that a new tab appears in the course navigation.

• Verify the staticTab content by clicking on tab.