IR text tests: Stable blank lines between declarations in class

Rework rendering of kt-like dump and signatures dump in order to avoid
unstable blank line between declarations of the same level:
1. No blank line for the first declaration inside the member scope of
the class.
2. Always a single blank line between each two subsequent declarations
inside the member scope of the class.

compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.fir.kt.txt

@@ -23,7 +23,6 @@ class TestClass {
 
 @TestAnn(x = "interface")
 interface TestInterface {
-
 }
 
 @TestAnn(x = "object")

compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.kt.txt

@@ -23,7 +23,6 @@ class TestClass {
 
 @TestAnn(x = "interface")
 interface TestInterface {
-
 }
 
 @TestAnn(x = "object")

compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.sig.kt.txt

@@ -86,6 +86,7 @@ enum class TestEnum : Enum<TestEnum> {
   //   Public signature: /TestEnum.<init>|-5645683436151566731[0]
   //   Public signature debug description: <init>(){}
   private constructor() /* primary */
+
   // CHECK JVM_IR:
   //   Mangled name: TestEnum#valueOf#static(kotlin.String){}TestEnum
   //   Public signature: /TestEnum.valueOf|1811575739170804829[0]
@@ -198,7 +199,6 @@ enum class TestEnum : Enum<TestEnum> {
 //   Public signature: /TestInterface|null[0]
 @TestAnn(x = "interface")
 interface TestInterface {
-
 }
 
 // CHECK:

compiler/testData/ir/irText/declarations/annotations/constructorsWithAnnotations.sig.kt.txt

@@ -35,6 +35,7 @@ class TestClass {
   //   Public signature debug description: <init>(){}
   @TestAnn(x = 1)
   constructor() /* primary */
+
   // CHECK:
   //   Mangled name: TestClass#<init>(kotlin.Int){}
   //   Public signature: /TestClass.<init>|-5182794243525578284[0]

compiler/testData/ir/irText/declarations/annotations/enumsInAnnotationArguments.sig.kt.txt

@@ -34,6 +34,7 @@ enum class En : Enum<En> {
   //   Public signature: /En.<init>|-5645683436151566731[0]
   //   Public signature debug description: <init>(){}
   private constructor() /* primary */
+
   // CHECK:
   //   Mangled name: En.A
   //   Public signature: /En.A|null[0]

compiler/testData/ir/irText/declarations/annotations/genericAnnotationClasses.fir.kt.txt

@@ -27,7 +27,6 @@ open annotation class Test2<T1 : Any, T2 : Any?> : Annotation {
 }
 
 interface I<T : Any?> {
-
 }
 
 open annotation class Test3<T1 : Any?, T2 : I<T1>> : Annotation {

compiler/testData/ir/irText/declarations/annotations/genericAnnotationClasses.kt.txt

@@ -27,7 +27,6 @@ open annotation class Test2<T1 : Any, T2 : Any?> : Annotation {
 }
 
 interface I<T : Any?> {
-
 }
 
 open annotation class Test3<T1 : Any?, T2 : I<T1>> : Annotation {

compiler/testData/ir/irText/declarations/annotations/genericAnnotationClasses.sig.kt.txt

@@ -180,6 +180,5 @@ class CC {
 //   Mangled name: ann.I
 //   Public signature: ann/I|null[0]
 interface I<T : Any?> {
-
 }
 

compiler/testData/ir/irText/declarations/annotations/inheritingDeprecation.sig.kt.txt

@@ -128,7 +128,6 @@ class ExplicitOverride : IFoo {
 //   Mangled name: IFoo
 //   Public signature: /IFoo|null[0]
 interface IFoo {
-
   // CHECK:
   //   Mangled name: IFoo@kotlin.String{}extProp
   //   Public signature: /IFoo.extProp|9137761441129982647[0]