Add keybinds for deselect [ESC] and restore selection [E]

[AnniekStok]

part 1 of #325

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.33%. Comparing base (815ab22) to head (91634b5).

Files with missing lines	Patch %	Lines
..._tracker/data_views/views/tree_view/tree_widget.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
- Coverage   86.35%   86.33%   -0.03%     
==========================================
  Files          51       51              
  Lines        4244     4252       +8     
==========================================
+ Hits         3665     3671       +6     
- Misses        579      581       +2     

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[cmalinmayor]

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