CIF-2196: add --staged modifier for product full detail

[buuhuu]

To make styling of staged products easier this PR is adding a --staged modifier to the productFullDetail__root.

Related Issue

CIF-2192, CIF-2182

How Has This Been Tested?

Tested in the context of the cif core component examples

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov]

Codecov Report

Merging #612 (1d13fc7) into master (80890e8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #612   +/-   ##
=========================================
  Coverage     88.35%   88.35%           
  Complexity     1458     1458           
=========================================
  Files           268      268           
  Lines          6543     6543           
  Branches        985      985           
=========================================
  Hits           5781     5781           
  Misses          573      573           
  Partials        189      189           

Flag	Coverage Δ
integration	63.88% <ø> (ø)
jest	85.34% <ø> (ø)
karma	94.83% <ø> (ø)
unittests	88.05% <ø> (ø)

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