generatedLanguage is invalid when config comes from jsonConfigurationFile

[jxnu-liguobin]

Issue Description

Describe your bug in detail.

When I use JSON as the configuration(generate kotlin), the language can be generated successfully, but it does use Java type, as follows:

    val first: Integer,

This is a bug.

If I add a separate language configuration in build.gradle, it will not appear, as follows:

compileKotlin.dependsOn "graphqlCodegenKotlinService"
task graphqlCodegenKotlinService(type: GraphQLCodegenGradleTask) {
    graphqlSchemas.includePattern = "schema\\.graphqls"
    outputDir = new File("src/main/graphql")
    jsonConfigurationFile = "src/main/resources/codegen-config.json"
    generatedLanguage = GeneratedLanguage.KOTLIN // it will be invalid in json, add here
}

Steps to Reproduce

List in detail the exact steps to reproduce the unexpected behavior.

Expected Result

Explain in detail what behavior you expected to happen.

Actual Result

Explain in detail what behavior actually happened.

Your Environment and Setup

• graphql-java-codegen version: X.X.X
• Build tool: E.g.: Maven/Gradle/SBT
• Mapping Config: E.g.:

{
  "generateClient": true,
  "generateApis": true,
  "generatedLanguage": "KOTLIN",
  "generateBuilder": false,
  "generateImmutableModels": true,
  "apiPackageName": "io.github.graphql.resolver",
  "modelPackageName": "io.github.graphql.model",
  "generateModelOpenClasses": true,
  "modelNameSuffix": "TO"
}

[jxnu-liguobin]

@kobylynskyi The language judgment of all plug-ins has problems, ignoring the language judgment in JSON.

    private GraphQLCodegen instantiateCodegen(MappingConfig mappingConfig) throws IOException {
        switch (generatedLanguage) {// shouldnot use it.
            case JAVA:
                return new JavaGraphQLCodegen(getSchemas(), graphqlQueryIntrospectionResultPath, outputDir, mappingConfig, buildJsonSupplier(jsonConfigurationFile));
            case SCALA:
                return new ScalaGraphQLCodegen(getSchemas(), graphqlQueryIntrospectionResultPath, outputDir, mappingConfig, buildJsonSupplier(jsonConfigurationFile));
            case KOTLIN:
                return new KotlinGraphQLCodegen(getSchemas(), graphqlQueryIntrospectionResultPath, outputDir, mappingConfig, buildJsonSupplier(jsonConfigurationFile));
            default:
                throw new LanguageNotSupportedException(generatedLanguage);
        }
    }

[kobylynskyi]

@jxnu-liguobin appreciate your effort for fixing this. Will be released soon as part of 4.1.5