Ccs 3510 back button bug fix

[grantsydney]

We now have the ability to press the back button from Product Details to return to Product Listings

• refactored productDetails.tsx and productListing.tsx so they are now functional components
• created ProductContext so productDetails.tsx and productListing.tsx can access all product info

[codecov-io]

Codecov Report

Merging #477 (3b7010e) into master (4e8391e) will decrease coverage by 0.46%.
The diff coverage is 52.96%.

@@             Coverage Diff              @@
##             master     #477      +/-   ##
============================================
- Coverage     58.55%   58.08%   -0.47%     
- Complexity      495      499       +4     
============================================
  Files           126      128       +2     
  Lines          4034     4056      +22     
  Branches        553      576      +23     
============================================
- Hits           2362     2356       -6     
- Misses         1559     1585      +26     
- Partials        113      115       +2     

Flag	Coverage Δ	Complexity Δ
java	58.08% <52.96%> (-0.47%)	0.00 <13.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...edhat/pantheon/asciidoctor/AsciidoctorService.java	3.73% <0.00%> (+0.02%)	3.00 <0.00> (ø)
...ctor/extension/MetadataExtractorTreeProcessor.java	80.39% <ø> (-0.38%)	17.00 <0.00> (ø)
...n/servlet/assembly/AssemblyVariantJsonServlet.java	67.69% <0.00%> (-0.53%)	7.00 <0.00> (ø)
...at/pantheon/servlet/module/VariantJsonServlet.java	67.34% <0.00%> (-0.70%)	3.00 <0.00> (ø)
...om/redhat/pantheon/servlet/util/ServletHelper.java	55.40% <ø> (ø)	17.00 <0.00> (ø)
pantheon-bundle/frontend/src/app/versions.tsx	42.04% <14.28%> (-1.35%)	0.00 <0.00> (ø)
...undle/frontend/src/app/contexts/ProductContext.tsx	18.75% <18.75%> (ø)	0.00 <0.00> (?)
pantheon-bundle/frontend/src/app/product.tsx	44.31% <28.57%> (-8.07%)	0.00 <0.00> (ø)
...antheon-bundle/frontend/src/app/productDetails.tsx	47.12% <48.64%> (+6.16%)	0.00 <0.00> (ø)
...t/pantheon/servlet/module/ModuleVersionUpload.java	60.00% <50.00%> (-25.94%)	5.00 <2.00> (-4.00)
... and 9 more

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[wesruv]

Code looks good to me, @xdavidson can you test it before we approve?

[xdavidson]

I tested this branch locally. The backbutton works when I go from product details to product Listing.