Set custom PR status name

[lkysow]

Add a new flag --vcs-status-name for setting a custom status name that Atlantis will use for its PR statuses. Useful if you're running multiple Atlantis servers.

Notes

• Carries @js-timbirkett work from feat: Add ability to set pr status context with --status-name flag #841
• Closes feat: Add ability to set pr status context with --status-name flag #841

[codecov]

Codecov Report

Merging #904 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #904      +/-   ##
==========================================
+ Coverage    71.7%   71.71%   +0.01%     
==========================================
  Files          65       65              
  Lines        5276     5278       +2     
==========================================
+ Hits         3783     3785       +2     
  Misses       1199     1199              
  Partials      294      294

Impacted Files	Coverage Δ
server/events/runtime/env_step_runner.go	100% <ø> (ø)	⬆️
server/user_config.go	100% <ø> (ø)	⬆️
cmd/server.go	79.16% <100%> (+0.19%)	⬆️
server/events/commit_status_updater.go	100% <100%> (ø)	⬆️
server/server.go	63.1% <100%> (ø)	⬆️

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