Change packaging for macOS to DMG

[dgolovin]

Fix #1158 .

[codecov-io]

Codecov Report

Merging #1353 into master will decrease coverage by 1.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1353      +/-   ##
==========================================
- Coverage   93.25%   92.22%   -1.03%     
==========================================
  Files          47       47              
  Lines        4847     4966     +119     
  Branches      543      864     +321     
==========================================
+ Hits         4520     4580      +60     
- Misses        327      357      +30     
- Partials        0       29      +29

Impacted Files	Coverage Δ
browser/pages/start/controller.js	81.2% <0%> (-18.8%)	⬇️
browser/model/devstudio-autoinstall.js	97.29% <0%> (-2.71%)	⬇️
browser/pages/install/controller.js	91.86% <0%> (-1.75%)	⬇️
browser/model/helpers/downloader.js	95.53% <0%> (-1.68%)	⬇️
browser/model/che.js	95% <0%> (-1.62%)	⬇️
browser/services/platform.js	98.14% <0%> (-1.48%)	⬇️
browser/pages/account/controller.js	98.61% <0%> (-1.39%)	⬇️
browser/model/cdk.js	97.6% <0%> (-1.16%)	⬇️
browser/model/devstudio-p2-zip.js	64.4% <0%> (-1.12%)	⬇️
browser/model/installable-item.js	92.28% <0%> (-1.03%)	⬇️
... and 24 more

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[jrichter1]

Looks like no functionality gets broken by this (yay), so I'm trying to sum up what else would need to be changed (meh). So far I got this (anything missing?):

• the build job (the publishing part)
• docs RHDEVDOCS-727
• some of my scripts (which I can live with)

So if all the parties involved get updated, it should be good to go.

[dgolovin]

@jrichter1 We should put our build script to git as well, so we can fix them at the same time.

[dgolovin]

@jrichter1 this also opens opportunity to create shell script or app to uninstall on mac and put it next to installer inside dmg.

[dgolovin]

@jrichter1 I've tested installation for bundled installer and it worked for me, should we merge this PR?

[jrichter1]

It seems I'll need to change the way system tests launch on mac. I'm going to push it here and that should be enough to merge.

[jrichter1]

looks like we are good to go