Added deprecated PackageFragmentProvider#getPackageFragments for BWC

Relates to ^KT-33394
^KT-42259 Fixed

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/DescriptorByIdSignatureFinder.kt

@@ -83,7 +83,7 @@ class DescriptorByIdSignatureFinder(
             LookupMode.MODULE_ONLY -> {
                 (moduleDescriptor as ModuleDescriptorImpl)
                     .packageFragmentProviderForModuleContentWithoutDependencies
-                    .getPackageFragments(packageFqName)
+                    .packageFragments(packageFqName)
                     .flatMap { it.getMemberScope().loadDescriptors(declarationName, isLeaf) }
             }
         }

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/metadata/KlibMetadataMonolithicSerializer.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.backend.common.serialization.metadata
 
 import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+import org.jetbrains.kotlin.descriptors.packageFragments
 import org.jetbrains.kotlin.library.SerializedMetadata
 import org.jetbrains.kotlin.library.metadata.KlibMetadataProtoBuf
 import org.jetbrains.kotlin.metadata.ProtoBuf
@@ -28,7 +29,7 @@ class KlibMetadataMonolithicSerializer(
     private fun serializePackageFragment(fqName: FqName, module: ModuleDescriptor): List<ProtoBuf.PackageFragment> {
 
         val fragments = if (includeOnlyModuleContent) {
-            module.packageFragmentProviderForModuleContentWithoutDependencies.getPackageFragments(fqName)
+            module.packageFragmentProviderForModuleContentWithoutDependencies.packageFragments(fqName)
         } else {
             module.getPackage(fqName).fragments.filter { it.module == module }
         }