fix: add scroll to modal content when fullscreen

[navinkarkera]

Description

Studio modal doesn't allow authors to scroll when content is longer than the screen height, so this commit adds a max-height based on screen height.

Useful information to include:

• Which edX user roles will this change impact? : "Course Author",

Supporting information

• Private-ref: https://tasks.opencraft.com/browse/FAL-4368

Testing instructions

• Open edit modal of xblock like problem bank or coding-eval-xblock (https://github.com/open-craft/xblock-ai-evaluation/).
• Make it fullscreen using toggle option.
• Reduce the height of the window to be smaller than the content, scroll should appear. In master branch, we cannot see the content and no scroll bar appears.

Note: This bug mostly concerns legacy xblock editors (text, video and problem blocks editors do not open inside an iframe), but most of them have there own scroll implementation for its content so you won't be able to reproduce the issue with drag-and-drop, word-cloud, open-response etc.

Deadline

None.

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[Kelketek]

@navinkarkera

👍

• I tested this: Handling of the scroll bar works correctly now in full screen for legacy blocks.
• I read through the code
• I checked for accessibility issues
• Includes documentation N/A
• Added to the Code Drift project board (for backports)