If GitHub comments are over max size, split into multiple comments.

[lkysow]

Notes:

• Cherry-picks @rngtng's commit from [WIP][RFC] Fix broken format for continued comments on GitHub #203 and just adds some testing and changes the exact open/closing tags.
• Closes Formatting is broken when comments are continued on GitHub #111
• Closes [WIP][RFC] Fix broken format for continued comments on GitHub #203 since has that commit

[codecov]

Codecov Report

Merging #360 into master will decrease coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff            @@
##           master    #360      +/-   ##
=========================================
- Coverage   70.61%   70.6%   -0.01%     
=========================================
  Files          61      61              
  Lines        3682    3681       -1     
=========================================
- Hits         2600    2599       -1     
  Misses        901     901              
  Partials      181     181

Impacted Files	Coverage Δ
server/events/vcs/github_client.go	73.8% <83.33%> (-0.31%)	⬇️

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[rngtng]

nice, and so simple ;)