Remove global property withXml from Gradle plugin (Breaking change)

This is a "soft" breaking change: Plugin will no longer execute if
user have this option – which is good, b/c it never worked as expected.
We may want to hint this in the 8.0 release notes, so they can add it
to the `configOptions` map if required, or simply delete it

modules/openapi-generator-gradle-plugin/README.adoc

@@ -389,11 +389,6 @@ apply plugin: 'org.openapi.generator'
 |true
 |Defines whether or not api-related _documentation_ files should be generated.
 
-|withXml
-|Boolean
-|false
-|A special-case setting which configures some generators with XML support. In some cases, this forces json OR xml, so the default here is false.
-
 |configOptions
 |Map(String,String)
 |None

modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/OpenApiGeneratorPlugin.kt

@@ -144,7 +144,6 @@ class OpenApiGeneratorPlugin : Plugin<Project> {
                     generateModelDocumentation.set(generate.generateModelDocumentation)
                     generateApiTests.set(generate.generateApiTests)
                     generateApiDocumentation.set(generate.generateApiDocumentation)
-                    withXml.set(generate.withXml)
                     configOptions.set(generate.configOptions)
                     logToStderr.set(generate.logToStderr)
                     enablePostProcessFile.set(generate.enablePostProcessFile)

modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/extensions/OpenApiGeneratorGenerateExtension.kt

@@ -342,12 +342,6 @@ open class OpenApiGeneratorGenerateExtension(project: Project) {
      */
     val generateApiDocumentation = project.objects.property<Boolean>()
 
-    /**
-     * A special-case setting which configures some generators with XML support. In some cases,
-     * this forces json OR xml, so the default here is false.
-     */
-    val withXml = project.objects.property<Boolean>()
-
     /**
      * To write all log messages (not just errors) to STDOUT
      */
@@ -408,7 +402,6 @@ open class OpenApiGeneratorGenerateExtension(project: Project) {
         generateModelDocumentation.set(true)
         generateApiTests.set(true)
         generateApiDocumentation.set(true)
-        withXml.set(false)
         configOptions.set(mapOf())
         validateSpec.set(true)
         logToStderr.set(false)

modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/tasks/GenerateTask.kt

@@ -506,14 +506,6 @@ open class GenerateTask @Inject constructor(private val objectFactory: ObjectFac
     @Input
     val generateApiDocumentation = project.objects.property<Boolean>()
 
-    /**
-     * A special-case setting which configures some generators with XML support. In some cases,
-     * this forces json OR xml, so the default here is false.
-     */
-    @Optional
-    @Input
-    val withXml = project.objects.property<Boolean>()
-
     /**
      * To write all log messages (not just errors) to STDOUT
      */
@@ -680,10 +672,6 @@ open class GenerateTask @Inject constructor(private val objectFactory: ObjectFac
                 GlobalSettings.setProperty(CodegenConstants.API_TESTS, generateApiTests.get().toString())
             }
 
-            if (withXml.isPresent) {
-                GlobalSettings.setProperty(CodegenConstants.WITH_XML, withXml.get().toString())
-            }
-
             if (inputSpec.isPresent && remoteInputSpec.isPresent) {
                 logger.warn("Both inputSpec and remoteInputSpec is specified. The remoteInputSpec will take priority over inputSpec.")
             }