[FIR] Remove isEnumEntry field from FirJavaField

This field isn't used anymore because java enum entry is represented by
FirEnumEntry

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaSymbolProvider.kt

@@ -212,7 +212,6 @@ class JavaSymbolProvider(
                                 returnTypeRef = returnType.toFirJavaTypeRef(this@JavaSymbolProvider.session, javaTypeParameterStack)
                                 isVar = !javaField.isFinal
                                 isStatic = javaField.isStatic
-                                isEnumEntry = javaField.isEnumEntry
                                 addAnnotationsFrom(this@JavaSymbolProvider.session, javaField, javaTypeParameterStack)
                             }
                         }

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/declarations/FirJavaField.kt

@@ -42,7 +42,6 @@ class FirJavaField @FirImplementationDetail constructor(
     override val isVar: Boolean,
     override val annotations: MutableList<FirAnnotationCall>,
     override val typeParameters: MutableList<FirTypeParameter>,
-    val isEnumEntry: Boolean
 ) : FirField() {
     init {
         symbol.bind(this)
@@ -138,7 +137,6 @@ internal class FirJavaFieldBuilder : FirFieldBuilder() {
     var modality: Modality? = null
     lateinit var visibility: Visibility
     var isStatic: Boolean by Delegates.notNull()
-    var isEnumEntry: Boolean by Delegates.notNull()
 
     override var resolvePhase: FirResolvePhase = FirResolvePhase.ANALYZED_DEPENDENCIES
 
@@ -162,7 +160,6 @@ internal class FirJavaFieldBuilder : FirFieldBuilder() {
             isVar,
             annotations,
             typeParameters,
-            isEnumEntry
         )
     }
 

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/enhancement/SignatureEnhancement.kt

@@ -98,7 +98,6 @@ class FirSignatureEnhancement(
                     isVar = firElement.isVar
                     isStatic = firElement.isStatic
                     annotations += firElement.annotations
-                    this.isEnumEntry = isEnumEntry
                 }
                 return symbol
             }