CIF-2673 - Add navRoot checkbox to page properties

[herzog31]

Description

• Added UI tests for CIF-2673 - Add navRoot checkbox to page properties aem-core-cif-components#942.
• Updated landing-page template to set and enable the navRoot property by default.

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 #303 (242829d) into dev (b3ff537) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                dev     #303   +/-   ##
=========================================
  Coverage     77.14%   77.14%           
  Complexity       21       21           
=========================================
  Files             1        1           
  Lines            35       35           
  Branches          4        4           
=========================================
  Hits             27       27           
  Misses            6        6           
  Partials          2        2           

Flag	Coverage Δ
unittests	77.14% <ø> (ø)

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[buuhuu]

Should we add the navRoot=true property to the landingpage's initial content?