[LL API] Unify cache for 'not-under content root' modules

Before, 'FirSession's for not-under content root modules were stored in
a project-global service, which essentially means that even if one
creates a non-cached 'LLFirResolveSession', 'FirSession's for such
modules will be cached and reused later. Such exact behavior happened in
sealed class inheritor pre-analysis handler.

analysis/analysis-api-standalone/src/org/jetbrains/kotlin/analysis/api/standalone/RegisterComponentService.java

@@ -8,7 +8,6 @@ package org.jetbrains.kotlin.analysis.api.standalone;
 import com.intellij.mock.MockProject;
 import org.jetbrains.kotlin.analysis.low.level.api.fir.LLFirResolveSessionService;
 import org.jetbrains.kotlin.analysis.low.level.api.fir.project.structure.LLFirLibrarySessionFactory;
-import org.jetbrains.kotlin.analysis.low.level.api.fir.project.structure.LLFirNonUnderContentRootSessionFactory;
 
 class RegisterComponentService {
     static void registerLLFirLibrarySessionFactory(MockProject project) {
@@ -18,13 +17,6 @@ class RegisterComponentService {
         );
     }
 
-    static void registerLLFirNonUnderContentRootSessionFactory(MockProject project) {
-        project.registerService(
-                LLFirNonUnderContentRootSessionFactory.class,
-                new LLFirNonUnderContentRootSessionFactory(project)
-        );
-    }
-
     static void registerLLFirResolveSessionService(MockProject project) {
         project.registerService(
                 LLFirResolveSessionService.class,

analysis/analysis-api-standalone/src/org/jetbrains/kotlin/analysis/api/standalone/StandaloneAnalysisAPISessionBuilder.kt

@@ -138,7 +138,6 @@ public class StandaloneAnalysisAPISessionBuilder(
             )
             registerService(LLFirBuiltinsSessionFactory::class.java, LLFirBuiltinsSessionFactory(this))
             RegisterComponentService.registerLLFirLibrarySessionFactory(this)
-            RegisterComponentService.registerLLFirNonUnderContentRootSessionFactory(this)
 
             registerService(KotlinReferenceProvidersService::class.java, HLApiReferenceProviderService::class.java)
             registerService(KotlinReferenceProviderContributor::class.java, KotlinFirReferenceContributor::class.java)