chore: add Kuadrant to OSS Ecosystem

[guicassolato]

What type of PR is this?
chore: add Kuadrant to OSS Ecosystem

What this PR does / why we need it:
Adds the Kuadrant project to the list of adopters of Envoy Gateway.

Which issue(s) this PR fixes:
N/A

Release Notes: No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.20%. Comparing base (8e9fb3f) to head (41e4414).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5552   +/-   ##
=======================================
  Coverage   65.19%   65.20%           
=======================================
  Files         213      213           
  Lines       34080    34080           
=======================================
+ Hits        22220    22223    +3     
+ Misses      10534    10530    -4     
- Partials     1326     1327    +1     

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[shawnh2]

Thanks!

[Xunzhuo]

Thanks!