fix(contented-preview): with ContentNavigation non-unique react key

[fuxingloh]

What this PR does / why we need it:

As per title.

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[codecov]

Codecov Report

Merging #553 (148d1cc) into main (50c3cac) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main     #553   +/-   ##
=======================================
  Coverage   85.00%   85.00%           
=======================================
  Files          10       10           
  Lines         420      420           
  Branches       71       73    +2     
=======================================
  Hits          357      357           
  Misses         63       63           

Files Changed	Coverage Δ
...ages/contented-processor/src/ContentedProcessor.ts	86.41% <50.00%> (ø)