[27.x backport] Optimise docker stats to not require clearing the whole screen

[thaJeztah]

• backport Optimise docker stats to not require clearing the whole screen #5625
• follow-up to Buffer 'docker stats' text to avoid terminal flickering #5586 / [27.x backport] Buffer 'docker stats' text to avoid terminal flickering #5588

Instead of clearing the whole screen and then writing the new stats, we now write the new stats on top of the old text, and then clear the remaining text.

This is a more efficient way to update the stats, as it avoids the flickering that happens when the screen is cleared and rewritten.

(cherry picked from commit cb2f95c)

- What I did

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- Description for the changelog

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[thaJeztah]

@laurazard @vvoland backporting this one as this is a follow-up to #5586, which was backported (#5588)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 58.54%. Comparing base (877668c) to head (39d73af).
Report is 3 commits behind head on 27.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             27.x    #5635      +/-   ##
==========================================
- Coverage   58.55%   58.54%   -0.02%     
==========================================
  Files         346      346              
  Lines       29329    29335       +6     
==========================================
  Hits        17173    17173              
- Misses      11178    11184       +6     
  Partials      978      978              

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