add more test coverage for federation

[smyrick]

Add some unit tests for non-covered files to get us higher before the 1.0.0 release

No code changes, just move and add test files

[codecov-io]

Codecov Report

Merging #327 into master will increase coverage by 2.45%.
The diff coverage is 73.68%.

@@             Coverage Diff              @@
##             master     #327      +/-   ##
============================================
+ Coverage     93.66%   96.11%   +2.45%     
  Complexity      274      274              
============================================
  Files            79       80       +1     
  Lines           979      979              
  Branches        178      180       +2     
============================================
+ Hits            917      941      +24     
+ Misses           36       11      -25     
- Partials         26       27       +1

Impacted Files	Coverage Δ	Complexity Δ
...oup/graphql/federation/execution/EntityResolver.kt	86.95% <0%> (+4.02%)	2 <0> (-4)	⬇️
...diagroup/graphql/federation/execution/resolvers.kt	77.77% <77.77%> (ø)	0 <0> (?)
...expediagroup/graphql/federation/types/_FieldSet.kt	100% <0%> (+46.15%)	0% <0%> (ø)	⬇️
.../com/expediagroup/graphql/federation/types/_Any.kt	86.95% <0%> (+56.52%)	0% <0%> (ø)	⬇️
...ql/federation/exception/FederatedRequestFailure.kt	100% <0%> (+71.42%)	6% <0%> (+4%)	⬆️

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