[FIR] buildErrorExpression for labels with underscored name

Add ConeDiagnosticWithSource, ConeUnderscoreIsReserved, ConeUnderscoreUsageWithoutBackticks diagnostics

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/diagnostics/FirDiagnostics.kt

@@ -13,6 +13,7 @@ import org.jetbrains.kotlin.fir.declarations.FirRegularClass
 import org.jetbrains.kotlin.fir.declarations.FirVariable
 import org.jetbrains.kotlin.fir.diagnostics.ConeDiagnostic
 import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.diagnostics.ConeDiagnosticWithSource
 import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.resolve.calls.Candidate
 import org.jetbrains.kotlin.fir.symbols.FirBasedSymbol
@@ -112,8 +113,8 @@ abstract class ConeUnmatchedTypeArgumentsError(val desiredCount: Int, val type:
 class ConeWrongNumberOfTypeArgumentsError(
     val desiredCount: Int,
     val symbol: FirRegularClassSymbol,
-    val source: FirSourceElement?
-) : ConeDiagnostic() {
+    source: FirSourceElement
+) : ConeDiagnosticWithSource(source) {
     override val reason: String get() = "Wrong number of type arguments"
 }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/providers/impl/FirTypeResolverImpl.kt

@@ -301,13 +301,16 @@ class FirTypeResolverImpl(private val session: FirSession) : FirTypeResolver() {
                 (parameterClass != null && parameterClass.classId.relativeClassName.parent().isRoot)
                 || outerClass != null
             ) {
-                return ConeClassErrorType(
-                    ConeWrongNumberOfTypeArgumentsError(
-                        actualTypeParametersCount,
-                        parameterClass?.symbol ?: symbol,
-                        getTypeArgumentsOrNameSource(userTypeRef, qualifierPartIndex)
+                val source = getTypeArgumentsOrNameSource(userTypeRef, qualifierPartIndex)
+                if (source != null) {
+                    return ConeClassErrorType(
+                        ConeWrongNumberOfTypeArgumentsError(
+                            actualTypeParametersCount,
+                            parameterClass?.symbol ?: symbol,
+                            source
+                        )
                     )
-                )
+                }
             }
         }