Remove obsolete code used to load module annotations

`CliModuleAnnotationsResolver.getAnnotationsOnContainingModule` took
0.5% of total compilation time on IntelliJ.

 #KT-48233

compiler/frontend/src/org/jetbrains/kotlin/resolve/ModuleAnnotationsResolver.kt

@@ -10,6 +10,10 @@ import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.name.ClassId
 
+// This interface was introduced to load module annotations for Kotlin/JVM to support the -Xexperimental mode, where the whole module
+// would be marked as experimental, and usages of any declarations from the module would require an explicit opt-in.
+// It was decided to remove this feature shortly thereafter, so now this interface is unused.
+// It can be useful again in the future if there are going to be other use cases for module annotations.
 interface ModuleAnnotationsResolver {
     fun getAnnotationsOnContainingModule(descriptor: DeclarationDescriptor): List<ClassId>
 

compiler/frontend/src/org/jetbrains/kotlin/resolve/checkers/ExperimentalUsageChecker.kt

@@ -35,13 +35,13 @@ import org.jetbrains.kotlin.resolve.*
 import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
 import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
-import org.jetbrains.kotlin.resolve.checkers.OptInNames.REQUIRES_OPT_IN_FQ_NAMES
 import org.jetbrains.kotlin.resolve.checkers.OptInNames.OLD_EXPERIMENTAL_FQ_NAME
 import org.jetbrains.kotlin.resolve.checkers.OptInNames.OLD_USE_EXPERIMENTAL_FQ_NAME
 import org.jetbrains.kotlin.resolve.checkers.OptInNames.OPT_IN_FQ_NAME
-import org.jetbrains.kotlin.resolve.checkers.OptInNames.REQUIRES_OPT_IN_FQ_NAME
-import org.jetbrains.kotlin.resolve.checkers.OptInNames.USE_EXPERIMENTAL_ANNOTATION_CLASS
 import org.jetbrains.kotlin.resolve.checkers.OptInNames.OPT_IN_FQ_NAMES
+import org.jetbrains.kotlin.resolve.checkers.OptInNames.REQUIRES_OPT_IN_FQ_NAME
+import org.jetbrains.kotlin.resolve.checkers.OptInNames.REQUIRES_OPT_IN_FQ_NAMES
+import org.jetbrains.kotlin.resolve.checkers.OptInNames.USE_EXPERIMENTAL_ANNOTATION_CLASS
 import org.jetbrains.kotlin.resolve.checkers.OptInNames.WAS_EXPERIMENTAL_FQ_NAME
 import org.jetbrains.kotlin.resolve.constants.ArrayValue
 import org.jetbrains.kotlin.resolve.constants.EnumValue
@@ -52,7 +52,6 @@ import org.jetbrains.kotlin.resolve.deprecation.DeprecationResolver
 import org.jetbrains.kotlin.resolve.deprecation.DeprecationSettings
 import org.jetbrains.kotlin.resolve.descriptorUtil.annotationClass
 import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
-import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
 import org.jetbrains.kotlin.types.AbbreviatedType
 import org.jetbrains.kotlin.types.KotlinType
@@ -236,11 +235,6 @@ class ExperimentalUsageChecker(project: Project) : CallChecker {
                 result.addAll(container.loadExperimentalities(moduleAnnotationsResolver, languageVersionSettings, visited, useFutureError))
             }
 
-            for (moduleAnnotationClassId in moduleAnnotationsResolver.getAnnotationsOnContainingModule(this)) {
-                val annotationClass = module.findClassAcrossModuleDependencies(moduleAnnotationClassId)
-                result.addIfNotNull(annotationClass?.loadExperimentalityForMarkerAnnotation())
-            }
-
             return result
         }