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

#KT-55672 Fixed

compiler/tests/org/jetbrains/kotlin/psi/OperatorNamesToSymbolsTest.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.psi
+
+import org.jetbrains.kotlin.lexer.KtSingleValueToken
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.types.expressions.OperatorConventions
+import org.jetbrains.kotlin.util.OperatorNameConventions
+import org.junit.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+
+class OperatorNamesToSymbolsTest {
+    @Test
+    fun testAllOperatorsMapped() {
+        val allEntries = OperatorNameConventions.TOKENS_BY_OPERATOR_NAME.toMutableMap()
+        val mapName = "${OperatorNameConventions::class.java.simpleName}.${OperatorNameConventions::TOKENS_BY_OPERATOR_NAME.name}"
+
+        fun check(token: KtSingleValueToken, name: Name) {
+            val mappedToken = allEntries.remove(name)
+            assertNotNull(mappedToken, "'$name' not in $mapName")
+            assertEquals(token.value, mappedToken, "Token not matching")
+        }
+
+        for ((token, name) in OperatorConventions.UNARY_OPERATION_NAMES) {
+            check(token, name)
+        }
+
+        for ((token, name) in OperatorConventions.BINARY_OPERATION_NAMES) {
+            check(token, name)
+        }
+
+        assertTrue(
+            allEntries.isEmpty(),
+            "Entries in $mapName that were not in ${OperatorConventions::class.java.simpleName}: ${allEntries.entries.joinToString()}"
+        )
+    }
+}