Add OpenShift: Welcome command to open welcome page

[dgolovin]

This PR fixes #2093.

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

[codecov]

Codecov Report

Merging #2094 (0f4cda6) into master (f989e31) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2094      +/-   ##
==========================================
+ Coverage   76.35%   76.40%   +0.05%     
==========================================
  Files          47       48       +1     
  Lines        3214     3221       +7     
  Branches      612      612              
==========================================
+ Hits         2454     2461       +7     
  Misses        760      760              

Impacted Files	Coverage Δ
src/extension.ts	81.81% <100.00%> (-0.54%)	⬇️
src/welcomePage.ts	100.00% <100.00%> (ø)

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