KT-65684: KAPT: (Re)enable fallback to K1 KAPT and make it default

[KAPT] KT-65684 Set languageVersion=1.9 in KaptToolIntegrationTestGenerated

[KAPT] KT-65684 Re-enable a few now-passing tests in Kapt4IT

[KAPT] KT-65684 Fix the logic setting -Xuse-kapt4 flag in Kapt4IT.forceKapt4()

The change is needed to make sure that all the tests have the flag set,
 otherwise some of them would silently switch to the fallback node.
Also disables a few now failing tests.

[KAPT] KT-65684 Revert "KT-64385 Enable K2 KAPT by default"

This reverts commit 7e9d6e60


Merge-request: KT-MR-14291
Merged-by: Pavel Mikhailovskii <Pavel.Mikhailovskii@jetbrains.com>

plugins/kapt3/kapt3-cli/testData/integration/argfile/kaptArgs.txt

@@ -1,4 +1,3 @@
--language-version 1.9
 -Kapt-stubs=output/stubs
 -Kapt-classes=output/classes
 -Kapt-sources=output/sources

plugins/kapt3/kapt3-cli/testData/integration/fallback/Test.kt

@@ -0,0 +1,19 @@
+package test
+
+import apt.Anno
+import generated.Test as TestGenerated
+
+@Anno
+class Test {
+    @field:Anno
+    val property: String = ""
+
+    @Anno
+    fun function() {
+
+    }
+}
+
+fun main() {
+    println("Generated class: " + TestGenerated::class.java.name)
+}

plugins/kapt3/kapt3-cli/testData/integration/fallback/ap/META-INF/services/javax.annotation.processing.Processor

@@ -0,0 +1 @@
+apt.SampleApt

plugins/kapt3/kapt3-cli/testData/integration/fallback/ap/Processor.kt

@@ -0,0 +1,34 @@
+package apt
+
+import javax.annotation.processing.*
+import javax.lang.model.SourceVersion
+import javax.lang.model.element.TypeElement
+import javax.tools.Diagnostic.Kind.*
+import javax.tools.StandardLocation
+
+annotation class Anno
+
+class SampleApt : AbstractProcessor() {
+    override fun process(annotations: Set<TypeElement>, roundEnv: RoundEnvironment): Boolean {
+        val writeKotlinFiles = processingEnv.options["kapt.test.writeKotlinFiles"] == "true"
+
+        for (element in roundEnv.getElementsAnnotatedWith(Anno::class.java)) {
+            val generatedSimpleName = element.simpleName.toString().capitalize()
+
+            val file = when (writeKotlinFiles) {
+                true -> processingEnv.filer.createResource(StandardLocation.SOURCE_OUTPUT, "generated", "$generatedSimpleName.kt")
+                false -> processingEnv.filer.createSourceFile("generated.$generatedSimpleName")
+            }
+
+            file.openWriter().use {
+                it.write("package generated;\npublic class $generatedSimpleName {}")
+            }
+        }
+
+        return true
+    }
+
+    override fun getSupportedOptions() = setOf("kapt.test.writeKotlinFiles")
+    override fun getSupportedSourceVersion() = SourceVersion.RELEASE_8
+    override fun getSupportedAnnotationTypes() = setOf("apt.Anno")
+}

plugins/kapt3/kapt3-cli/testData/integration/fallback/build.txt

@@ -0,0 +1,69 @@
+# mkdir
+output/stubs
+output/classes
+output/javaClasses
+output/sources
+output/stubsAlt
+output/classesAlt
+output/javaClassesAlt
+output/sourcesAlt
+
+# kotlinc
+-language-version 2.0
+-cp %KOTLIN_STDLIB%
+-d output/ap.jar
+ap/Processor.kt
+
+# copy
+ap/META-INF/services/javax.annotation.processing.Processor
+output/ap/META-INF/services/javax.annotation.processing.Processor
+
+# kapt
+-Xuse-k2
+-Kapt-stubs=output/stubs
+-Kapt-classes=output/classes
+-Kapt-sources=output/sources
+-Kapt-classpath=output/ap
+-d output/classes
+-cp output/ap.jar:%KOTLIN_STDLIB%
+Test.kt
+
+# javac
+-cp output/ap.jar
+-d output/javaClasses
+-proc:none
+output/sources/generated/Function.java
+output/sources/generated/Property.java
+output/sources/generated/Test.java
+
+# kapt
+-language-version 2.0
+-Kapt-stubs=output/stubsAlt
+-Kapt-classes=output/classesAlt
+-Kapt-sources=output/sourcesAlt
+-Kapt-classpath=output/ap
+-d output/classesAlt
+-cp output/ap.jar:%KOTLIN_STDLIB%
+Test.kt
+
+# output
+warning: kapt currently doesn't support language version 2.0+. Falling back to 1.9.
+
+# java
+-cp output/classes:output/javaClasses:output/ap.jar:%KOTLIN_STDLIB%
+test.TestKt
+
+# javac
+-cp output/ap.jar
+-d output/javaClassesAlt
+-proc:none
+output/sourcesAlt/generated/Function.java
+output/sourcesAlt/generated/Property.java
+output/sourcesAlt/generated/Test.java
+
+# java
+-cp output/classes:output/javaClassesAlt:output/ap.jar:%KOTLIN_STDLIB%
+test.TestKt
+
+# after
+Generated class: generated.Test