Rewrite e2e tests to a sequence of pages

[jrichter1]

instead of one long test noodle, use a separate setup + test procedure for each page for easier maintenance and extending

[codecov-io]

Codecov Report

Merging #837 into master will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #837      +/-   ##
==========================================
- Coverage   96.49%   96.32%   -0.17%     
==========================================
  Files          35       35              
  Lines        3191     3375     +184     
  Branches      268      482     +214     
==========================================
+ Hits         3079     3251     +172     
- Misses        112      114       +2     
- Partials        0       10      +10

Impacted Files	Coverage Δ
browser/model/devstudio.js	88.17% <0%> (-1.83%)	⬇️
browser/model/helpers/downloader.js	96.94% <0%> (-1.52%)	⬇️
browser/model/jbosseap.js	98.8% <0%> (-1.2%)	⬇️
browser/pages/about/controller.js	21.05% <0%> (-1.17%)	⬇️
browser/directives/componentPanel.js	14.28% <0%> (-1.1%)	⬇️
browser/pages/confirm/controller.js	89.71% <0%> (-0.93%)	⬇️
browser/services/data.js	97.03% <0%> (-0.92%)	⬇️
browser/model/jbossfuse.js	99.21% <0%> (-0.79%)	⬇️
browser/model/cdk.js	99.22% <0%> (-0.78%)	⬇️
browser/model/jdk-install.js	97.29% <0%> (-0.45%)	⬇️
... and 21 more

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