[FIR, Tests] Don't filter out syntax errors in tests

#KT-58469

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/handlers/FirDiagnosticsHandler.kt

@@ -341,8 +341,6 @@ fun List<KtDiagnostic>.diagnosticCodeMetaInfos(
             diagnostic.severity
         )
     ) return@flatMap emptyList()
-    // SYNTAX errors will be reported later
-    if (diagnostic.factory == FirSyntaxErrors.SYNTAX) return@flatMap emptyList()
     if (!diagnostic.isValid) return@flatMap emptyList()
     diagnostic.toMetaInfos(
         module,