LM - Video Template - Fix 0 height for video container in FSE.

[dadish]

Fixes #5925 Fixes #5861

Changes proposed in this Pull Request

• Fixes the height issue for Video Container block in FSE for LM Video template.
• Fixes the alignment issue for LM template when there is no video.

Testing instructions

• Activate LM Video template.
• Open FSE and edit LM Video template.
• Confirm that you see Notices, Post Content and Lesson Actions blocks below the Video Container block.
• Visit a lesson page without Featured Video in it and confirm the top of the post content is aligned with the top of the sidebar on the right.

Screenshot / Video

Before (Frontent)

Before (Editor)

After (Frontend)

After (Editor)

[codecov[bot]]

Codecov Report

Merging #5926 (e329214) into trunk (ea8b3e7) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              trunk    #5926   +/-   ##
=========================================
  Coverage     44.45%   44.45%           
  Complexity     9053     9053           
=========================================
  Files           441      441           
  Lines         32411    32411           
  Branches        274      274           
=========================================
  Hits          14407    14407           
  Misses        17799    17799           
  Partials        205      205           

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