[BD-46] fix glitch on loading spinner

[khudym]

Description

Add overflow:hidden to spinner`s container to avoid height glitch during the animation
Issue

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0ef92d9) 91.69% compared to head (6e85f30) 91.69%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2599   +/-   ##
=======================================
  Coverage   91.69%   91.69%           
=======================================
  Files         235      235           
  Lines        4214     4214           
  Branches     1021     1021           
=======================================
  Hits         3864     3864           
  Misses        346      346           
  Partials        4        4           

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[edx-semantic-release]

🎉 This PR is included in version 21.1.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[edx-semantic-release]

🎉 This PR is included in version 22.0.0-alpha.6 🎉

The release is available on:

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• GitHub release

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