chore: exclude the example app from code coverage

[smyrick]

Instead of deleting the tests, we can just exclude this project from the reports

This is the previous PR #290

[codecov]

Codecov Report

Merging #297 into master will increase coverage by 26.12%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master     #297       +/-   ##
=============================================
+ Coverage     68.15%   94.27%   +26.12%     
+ Complexity      263      260        -3     
=============================================
  Files           115       73       -42     
  Lines          1275      909      -366     
  Branches        196      169       -27     
=============================================
- Hits            869      857       -12     
+ Misses          385       31      -354     
  Partials         21       21

Impacted Files	Coverage Δ	Complexity Δ
...a/graphql/sample/exceptions/ValidationException.kt
...m/expedia/graphql/sample/query/PolymorphicQuery.kt
...mple/directives/StringEvalSchemaDirectiveWiring.kt
...hql/sample/extension/CustomSchemaGeneratorHooks.kt
.../kotlin/com/expedia/graphql/sample/QueryHandler.kt
.../expedia/graphql/sample/mutation/WidgetMutation.kt
...in/kotlin/com/expedia/graphql/sample/model/Node.kt
...in/com/expedia/graphql/sample/query/WidgetQuery.kt
...pedia/graphql/sample/query/CustomDirectiveQuery.kt
...edia/graphql/sample/query/PrivateInterfaceQuery.kt
... and 32 more

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[smyrick]

🎉 +26.12%