[FIR] Support when exhaustiveness for java enum

The problem appear because for java enum its entries was represented by
FirJavaField. To fix this FirEnumEntry was used

#KT-39621 Fixed

compiler/testData/loadJava/compiledJava/annotations/AnnotatedEnumEntry.fir.txt

@@ -1,10 +1,7 @@
 public final enum class AnnotatedEnumEntry : R|kotlin/Enum<ft<test/AnnotatedEnumEntry, test/AnnotatedEnumEntry?>!>| {
-    @R|test/AnnotatedEnumEntry.Anno|(String(a)) public final static field E1: R|test/AnnotatedEnumEntry|
-
-    @R|test/AnnotatedEnumEntry.Anno|(String(b)) @R|test/AnnotatedEnumEntry.Anno2|() public final static field E2: R|test/AnnotatedEnumEntry|
-
-    public final static field E3: R|test/AnnotatedEnumEntry|
-
+    @R|test/AnnotatedEnumEntry.Anno|(String(a)) public final static enum entry E1: R|test/AnnotatedEnumEntry|
+    @R|test/AnnotatedEnumEntry.Anno|(String(b)) @R|test/AnnotatedEnumEntry.Anno2|() public final static enum entry E2: R|test/AnnotatedEnumEntry|
+    public final static enum entry E3: R|test/AnnotatedEnumEntry|
     public final static fun values(): R|kotlin/Array<test/AnnotatedEnumEntry>| {
     }
 

compiler/testData/loadJava/compiledJava/annotations/EnumConstructorParameter.fir.txt

@@ -1,6 +1,5 @@
 public final enum class EnumConstructorParameter : R|kotlin/Enum<ft<test/EnumConstructorParameter, test/EnumConstructorParameter?>!>| {
-    public final static field INSTANCE: R|test/EnumConstructorParameter|
-
+    public final static enum entry INSTANCE: R|test/EnumConstructorParameter|
     private constructor(@R|test/EnumConstructorParameter.Anno|(String(string)) s: R|ft<kotlin/String, kotlin/String?>!|): R|test/EnumConstructorParameter|
 
     private constructor(x: R|kotlin/Int|): R|test/EnumConstructorParameter|

compiler/testData/loadJava/compiledJava/enum/EnumMembers.fir.txt

@@ -1,8 +1,6 @@
 public final enum class EnumMembers : R|kotlin/Enum<ft<test/EnumMembers, test/EnumMembers?>!>| {
-    public final static field FIRST: R|test/EnumMembers|
-
-    public final static field SECOND: R|test/EnumMembers|
-
+    public final static enum entry FIRST: R|test/EnumMembers|
+    public final static enum entry SECOND: R|test/EnumMembers|
     public final field isFirst: R|kotlin/Boolean|
 
     public open fun first(): R|kotlin/Boolean|

compiler/testData/loadJava/compiledJava/enum/EnumWithSpecializedEntry.fir.txt

@@ -1,8 +1,6 @@
 public open enum class EnumWithSpecializedEntry : R|kotlin/Enum<ft<test/EnumWithSpecializedEntry, test/EnumWithSpecializedEntry?>!>| {
-    public final static field E1: R|test/EnumWithSpecializedEntry|
-
-    public final static field E2: R|test/EnumWithSpecializedEntry|
-
+    public final static enum entry E1: R|test/EnumWithSpecializedEntry|
+    public final static enum entry E2: R|test/EnumWithSpecializedEntry|
     public final static fun values(): R|kotlin/Array<test/EnumWithSpecializedEntry>| {
     }
 

compiler/testData/loadJava/compiledJava/enum/JavaEnum.fir.txt

@@ -1,8 +1,6 @@
 public final enum class JavaEnum : R|kotlin/Enum<ft<test/JavaEnum, test/JavaEnum?>!>| {
-    public final static field ENTRY: R|test/JavaEnum|
-
-    public final static field ANOTHER: R|test/JavaEnum|
-
+    public final static enum entry ENTRY: R|test/JavaEnum|
+    public final static enum entry ANOTHER: R|test/JavaEnum|
     public final static fun values(): R|kotlin/Array<test/JavaEnum>| {
     }
 

compiler/testData/loadJava/compiledJava/static/Enum.fir.txt

@@ -1,10 +1,7 @@
 public final enum class Enum : R|kotlin/Enum<ft<test/Enum, test/Enum?>!>| {
-    public final static field A: R|test/Enum|
-
-    public final static field B: R|test/Enum|
-
-    public final static field C: R|test/Enum|
-
+    public final static enum entry A: R|test/Enum|
+    public final static enum entry B: R|test/Enum|
+    public final static enum entry C: R|test/Enum|
     public final static fun values(): R|kotlin/Array<test/Enum>| {
     }
 

compiler/testData/loadJava/compiledJava/static/StaticMembersInEnum.fir.txt

@@ -1,6 +1,5 @@
 public final enum class StaticMembersInEnum : R|kotlin/Enum<ft<test/StaticMembersInEnum, test/StaticMembersInEnum?>!>| {
-    public final static field ENTRY: R|test/StaticMembersInEnum|
-
+    public final static enum entry ENTRY: R|test/StaticMembersInEnum|
     public open static field STATIC_FIELD: R|kotlin/Int|
 
     public final static field CONSTANT: R|ft<test/StaticMembersInEnum, test/StaticMembersInEnum?>!|