fix: use stream().distinct() to remove duplicates from root entities

[igdianov]

No description provided.

[codecov]

Codecov Report

Merging #128 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #128      +/-   ##
============================================
+ Coverage      67.1%   67.13%   +0.03%     
  Complexity      403      403              
============================================
  Files            33       33              
  Lines          2067     2069       +2     
  Branches        307      307              
============================================
+ Hits           1387     1389       +2     
  Misses          555      555              
  Partials        125      125

Impacted Files	Coverage Δ	Complexity Δ
.../query/schema/impl/GraphQLJpaQueryDataFetcher.java	93.68% <100%> (+0.13%)	23 <0> (ø)	⬇️

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