CIF-2673 - Add navRoot checkbox to page properties

[herzog31]

Description

• Added Landing Page checkbox to properties page of CIF page component (v1, v2 and v3).
• Added ShowNavRootRenderConditionServlet to show checkbox only on pages that are either the landing page or don't have a landing page in the hierarchy.
• Added unit tests.

How Has This Been Tested?

• UI tests in Venia

Types of changes

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

Checklist:

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

[codecov[bot]]

Codecov Report

Merging #942 (f630dcd) into master (9c0a815) will decrease coverage by 0.00%. The diff coverage is 84.61%.

@@             Coverage Diff              @@
##             master     #942      +/-   ##
============================================
- Coverage     89.72%   89.71%   -0.01%     
- Complexity     2148     2154       +6     
============================================
  Files           346      347       +1     
  Lines          9660     9673      +13     
  Branches       1391     1394       +3     
============================================
+ Hits           8667     8678      +11     
- Misses          712      713       +1     
- Partials        281      282       +1     

Flag	Coverage Δ
integration	52.28% <61.53%> (+0.03%)	:arrow_up:
jest	86.55% <ø> (ø)
karma	95.33% <ø> (ø)
unittests	88.79% <84.61%> (-0.01%)	:arrow_down:

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

Impacted Files	Coverage Δ
...al/servlets/ShowNavRootRenderConditionServlet.java	84.61% <84.61%> (ø)

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