docs: Add Documentation for Istio

[omerfsen]

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (52e05a1) 49.77% compared to head (84643d6) 49.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14197      +/-   ##
==========================================
- Coverage   49.77%   49.76%   -0.01%     
==========================================
  Files         261      261              
  Lines       44667    44667              
==========================================
- Hits        22233    22230       -3     
- Misses      20249    20251       +2     
- Partials     2185     2186       +1     

see 1 file with indirect coverage changes

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