Update GitHub regex to match http(s):// URLs in addition to SSH URLs

[smurching]

• Updates the regex used to identify GitHub repo URLs in the frontend to match HTTP(S) URLs, and adds a unit test verifying this behavior
• Also display a link to a specific GitHub version in the run view page

[codecov-io]

Codecov Report

Merging #235 into master will increase coverage by 0.03%.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##           master    #235      +/-   ##
=========================================
+ Coverage   55.46%   55.5%   +0.03%     
=========================================
  Files         100     100              
  Lines        5028    5027       -1     
=========================================
+ Hits         2789    2790       +1     
+ Misses       2239    2237       -2

Impacted Files	Coverage Δ
mlflow/server/js/src/components/RunView.js	0% <ø> (ø)	⬆️
mlflow/server/js/src/utils/Utils.js	38% <33.33%> (+2.7%)	⬆️

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