Fix main Gradle plugins variants were published unshadowed

The problem comes from "com.gradle.plugin-publish" plugin. It asks to
run 'jar' task even if this tasks outputs are removed from artifacts.
As 'jar' and shadow 'embeddedJar' tasks outputs has the same name and
'jar' task runs after shadow one - this leads to jar file overwrite.
And eventually publishing unshadowed artifact.

buildSrc/src/main/kotlin/gradle-plugin-common-configuration.gradle.kts

@@ -46,6 +46,14 @@ tasks {
 val commonSourceSet = createGradleCommonSourceSet()
 reconfigureMainSourcesSetForGradlePlugin(commonSourceSet)
 publishShadowedJar(sourceSets[SourceSet.MAIN_SOURCE_SET_NAME], commonSourceSet)
+
+// Disabling this task, so "com.gradle.plugin-publish" will not publish unshadowed jar into Gradle Plugin Portal
+// Without it 'jar' task is asked to run by "com.gradle.plugin-publish" even if artifacts are removed. The problem
+// is that 'jar' task runs after shadow task plus their outputs has the same name leading to '.jar' file overwrite.
+tasks.named("jar") {
+    enabled = false
+}
+
 if (!kotlinBuildProperties.isInJpsBuildIdeaSync) {
     // Used for Gradle 7.0+ versions
     val gradle70SourceSet = createGradlePluginVariant(