[FIR] Print operator keyword and token to unresolved diagnostic message

#KT-55672 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -296,6 +296,7 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
     add(FirErrors.UNRESOLVED_REFERENCE) { firDiagnostic ->
         UnresolvedReferenceImpl(
             firDiagnostic.a,
+            firDiagnostic.b,
             firDiagnostic as KtPsiDiagnostic,
             token,
         )

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -251,6 +251,7 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
     interface UnresolvedReference : KtFirDiagnostic<PsiElement> {
         override val diagnosticClass get() = UnresolvedReference::class
         val reference: String
+        val operator: String?
     }
 
     interface UnresolvedLabel : KtFirDiagnostic<PsiElement> {

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -285,6 +285,7 @@ internal class InvisibleReferenceImpl(
 
 internal class UnresolvedReferenceImpl(
     override val reference: String,
+    override val operator: String?,
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.UnresolvedReference