Improvements to Remote Layout Downloading

[Gold872]

• Add menu to select which file to download from the robot
• Write unit tests

[codecov]

Codecov Report

Attention: Patch coverage is 87.69231% with 8 lines in your changes missing coverage. Please review.

Project coverage is 68.18%. Comparing base (66a882c) to head (40dc060).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/widgets/tab_grid.dart	63.63%	4 Missing ⚠️
lib/services/elastic_layout_downloader.dart	87.50%	3 Missing ⚠️
lib/pages/dashboard_page.dart	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
+ Coverage   67.03%   68.18%   +1.14%     
==========================================
  Files          79       79              
  Lines        8194     8245      +51     
==========================================
+ Hits         5493     5622     +129     
+ Misses       2701     2623      -78     

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