Build: enable -Werror in stdlib/core/compiler/plugins modules

Exclude modules where there are still warnings in an explicitly declared
variable `tasksWithWarnings`.

Also remove "-progressive" from compiler arguments in modules which are
built with non-latest language version, as the warning about that leads
to an error with -Werror.

compiler/build.gradle.kts

@@ -10,6 +10,8 @@ plugins {
 val compilerModules: Array<String> by rootProject.extra
 val otherCompilerModules = compilerModules.filter { it != path }
 
+val tasksWithWarnings: List<String> by rootProject.extra
+
 val effectSystemEnabled: Boolean by rootProject.extra
 val newInferenceEnabled: Boolean by rootProject.extra
 
@@ -85,6 +87,16 @@ if (kotlinBuildProperties.isInJpsBuildIdeaSync) {
     idea {
         this.module.generatedSourceDirs.add(generationRoot)
     }
+} else {
+    allprojects {
+        tasks.withType<KotlinCompile<*>> {
+            if (path !in tasksWithWarnings) {
+                kotlinOptions {
+                    allWarningsAsErrors = true
+                }
+            }
+        }
+    }
 }
 
 projectTest(parallel = true) {