Add Test command in App Explorer view and palette

[dgolovin]

This PR fixes #1974.

Signed-off-by: Denis Golovin dgolovin@redhat.com

[codecov]

Codecov Report

Merging #2024 (59d8dd3) into master (9572948) will decrease coverage by 0.17%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master    #2024      +/-   ##
==========================================
- Coverage   77.16%   76.99%   -0.18%     
==========================================
  Files          45       45              
  Lines        3017     3025       +8     
  Branches      576      579       +3     
==========================================
+ Hits         2328     2329       +1     
- Misses        689      696       +7     

Impacted Files	Coverage Δ
src/odo/command.ts	88.80% <0.00%> (-1.35%)	⬇️
src/openshift/component.ts	83.45% <16.66%> (-0.77%)	⬇️

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