[TreeView] Improve ENTER key behavior

[imnasnainaec]

Fixes #3215

• Adds functionality for Enter key to select the current domain when navigating the tree with arrows
• Removes ability to tab-select any of the domain tiles other than the current domain

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.77%. Comparing base (8b152c2) to head (d0f2610).
Report is 42 commits behind head on master.

Files with missing lines	Patch %	Lines
src/components/TreeView/TreeNavigator.tsx	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3221      +/-   ##
==========================================
- Coverage   74.80%   74.77%   -0.04%     
==========================================
  Files         277      277              
  Lines       10635    10637       +2     
  Branches     1278     1278              
==========================================
- Hits         7956     7954       -2     
- Misses       2315     2318       +3     
- Partials      364      365       +1     

Flag	Coverage Δ
backend	83.92% <ø> (-0.03%)	⬇️
frontend	66.69% <75.00%> (-0.05%)	⬇️

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[andracc]

Reviewed 2 of 2 files at r1, 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)