Remove @SimpleGradlePluginTests annotation

And related Gradle tasks to run it.

^KT-45745 Fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/build.gradle.kts

@@ -204,19 +204,6 @@ val allParallelTestsTask = tasks.register<Test>("kgpAllParallelTests") {
     if (isTeamcityBuild) finalizedBy(cleanTestKitCacheTask)
 }
 
-val simpleTestsTask = tasks.register<Test>("kgpSimpleTests") {
-    group = KGP_TEST_TASKS_GROUP
-    description = "Run only simple tests for Kotlin Gradle Plugin (deprecated)"
-    maxParallelForks = maxParallelTestForks
-
-    useJUnitPlatform {
-        includeTags("SimpleKGP")
-        includeEngines("junit-jupiter")
-    }
-
-    if (isTeamcityBuild) finalizedBy(cleanTestKitCacheTask)
-}
-
 val jvmTestsTask = tasks.register<Test>("kgpJvmTests") {
     group = KGP_TEST_TASKS_GROUP
     description = "Run tests for Kotlin/JVM part of Gradle plugin"
@@ -247,8 +234,6 @@ val daemonsTestsTask = tasks.register<Test>("kgpDaemonTests") {
     description = "Run only Gradle and Kotlin daemon tests for Kotlin Gradle Plugin"
     maxParallelForks = 1
 
-    mustRunAfter(simpleTestsTask)
-
     useJUnitPlatform {
         includeTags("DaemonsKGP")
         includeEngines("junit-jupiter")
@@ -296,7 +281,7 @@ val androidTestsTask = tasks.register<Test>("kgpAndroidTests") {
 
 tasks.named<Task>("check") {
     dependsOn("testAdvanceGradleVersion")
-    dependsOn(simpleTestsTask, jvmTestsTask, jsTestsTask, daemonsTestsTask, otherPluginsTestTask, mppTestsTask, androidTestsTask)
+    dependsOn(jvmTestsTask, jsTestsTask, daemonsTestsTask, otherPluginsTestTask, mppTestsTask, androidTestsTask)
     if (isTeamcityBuild) {
         dependsOn("testAdvanceGradleVersionMppAndAndroid")
         dependsOn("testMppAndAndroid")
@@ -346,7 +331,6 @@ tasks.withType<Test> {
 
     val shouldApplyJunitPlatform = name !in setOf(
         allParallelTestsTask.name,
-        simpleTestsTask.name,
         jvmTestsTask.name,
         jsTestsTask.name,
         daemonsTestsTask.name,

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/testTags.kt

@@ -7,15 +7,6 @@ package org.jetbrains.kotlin.gradle.testbase
 
 import org.junit.jupiter.api.Tag
 
-/**
- * Add it to test classes performing simple KGP checks (deprecated).
- */
-@Target(AnnotationTarget.CLASS, AnnotationTarget.ANNOTATION_CLASS, AnnotationTarget.FUNCTION)
-@Retention(AnnotationRetention.RUNTIME)
-@Tag("SimpleKGP")
-@Deprecated("will be removed soon", level = DeprecationLevel.ERROR)
-annotation class SimpleGradlePluginTests
-
 /**
  * Add it to test classes performing Gradle or Kotlin daemon checks.
  */