[FIR] Move registration components out of initializers of FirSession

compiler/tests-common/tests/org/jetbrains/kotlin/fir/AbstractFirBaseDiagnosticsTest.kt

@@ -88,7 +88,7 @@ abstract class AbstractFirBaseDiagnosticsTest : BaseDiagnosticsTest() {
             val scope = TopDownAnalyzerFacadeForJVM.newModuleSearchScope(
                 project,
                 moduleFiles.mapNotNull { it.ktFile })
-            FirJavaModuleBasedSession(info, sessionProvider, scope).also {
+            FirJavaModuleBasedSession.create(info, sessionProvider, scope).also {
                 registerFirExtensions(it.extensionService)
             }
         }

compiler/tests-common/tests/org/jetbrains/kotlin/fir/SessionTestUtils.kt

@@ -33,7 +33,7 @@ fun createSession(
 ): FirSession {
     val moduleInfo = FirTestModuleInfo(name = Name.identifier(moduleName))
     val provider = FirProjectSessionProvider(project)
-    return FirJavaModuleBasedSession(moduleInfo, provider, sourceScope).also {
+    return FirJavaModuleBasedSession.create(moduleInfo, provider, sourceScope).also {
         createSessionForDependencies(project, provider, moduleInfo, librariesScope, packagePartProvider)
         it.extensionService.registerExtensions(BunchOfRegisteredExtensions.empty())
     }