fix: use GrpaphQL execution context to resolve variable references

[igdianov]

No description provided.

[codecov]

Codecov Report

Merging #129 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #129      +/-   ##
============================================
- Coverage     68.19%   68.18%   -0.02%     
+ Complexity      403      400       -3     
============================================
  Files            33       33              
  Lines          2072     2065       -7     
  Branches        308      307       -1     
============================================
- Hits           1413     1408       -5     
+ Misses          533      532       -1     
+ Partials        126      125       -1

Impacted Files	Coverage Δ	Complexity Δ
...phql/jpa/query/schema/impl/GraphQLJpaExecutor.java	100% <100%> (+14.28%)	3 <1> (ø)	⬇️
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	73.75% <100%> (-0.14%)	128 <1> (-3)

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