[FIR] Create checker for simple enum entries with missing overrides

Complex enum entries (those with bodies) with missing overrides
are covered by an existing checker that checks all types of classes. But
simple enum entries (those without bodies) were not covered and require
a separate checker for missing overrides.

#KT-58637 Fixed

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

@@ -2474,6 +2474,16 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.ABSTRACT_MEMBER_NOT_IMPLEMENTED_BY_ENUM_ENTRY) { firDiagnostic ->
+        AbstractMemberNotImplementedByEnumEntryImpl(
+            firSymbolBuilder.buildSymbol(firDiagnostic.a),
+            firDiagnostic.b.map { firCallableSymbol ->
+                firSymbolBuilder.callableBuilder.buildCallableSymbol(firCallableSymbol)
+            },
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED) { firDiagnostic ->
         AbstractClassMemberNotImplementedImpl(
             firSymbolBuilder.classifierBuilder.buildClassLikeSymbol(firDiagnostic.a),

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

@@ -1758,6 +1758,12 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         val missingDeclaration: KtCallableSymbol
     }
 
+    interface AbstractMemberNotImplementedByEnumEntry : KtFirDiagnostic<KtEnumEntry> {
+        override val diagnosticClass get() = AbstractMemberNotImplementedByEnumEntry::class
+        val enumEntry: KtSymbol
+        val missingDeclarations: List<KtCallableSymbol>
+    }
+
     interface AbstractClassMemberNotImplemented : KtFirDiagnostic<KtClassOrObject> {
         override val diagnosticClass get() = AbstractClassMemberNotImplemented::class
         val classOrObject: KtClassLikeSymbol

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

@@ -2110,6 +2110,13 @@ internal class AbstractMemberNotImplementedImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<KtClassOrObject>(firDiagnostic, token), KtFirDiagnostic.AbstractMemberNotImplemented
 
+internal class AbstractMemberNotImplementedByEnumEntryImpl(
+    override val enumEntry: KtSymbol,
+    override val missingDeclarations: List<KtCallableSymbol>,
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<KtEnumEntry>(firDiagnostic, token), KtFirDiagnostic.AbstractMemberNotImplementedByEnumEntry
+
 internal class AbstractClassMemberNotImplementedImpl(
     override val classOrObject: KtClassLikeSymbol,
     override val missingDeclaration: KtCallableSymbol,