Add data class tests for header compilation.

^KT-78422

Author: aviroop-123

compiler/fir/analysis-tests/testData/resolve/headerMode/dataClassDeclaration.fir.txt

@@ -0,0 +1,19 @@
+FILE: dataClassDeclaration.kt
+    public final data class User : R|kotlin/Any| {
+        public constructor(name: R|kotlin/String|, age: R|kotlin/Int|): R|User| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final val name: R|kotlin/String| = R|<local>/name|
+            public get(): R|kotlin/String|
+
+        public final val age: R|kotlin/Int| = R|<local>/age|
+            public get(): R|kotlin/Int|
+
+        public final operator fun component1(): R|kotlin/String|
+
+        public final operator fun component2(): R|kotlin/Int|
+
+        public final fun copy(name: R|kotlin/String| = this@R|/User|.R|/User.name|, age: R|kotlin/Int| = this@R|/User|.R|/User.age|): R|User|
+
+    }

compiler/fir/analysis-tests/testData/resolve/headerMode/dataClassDeclaration.kt

@@ -0,0 +1,5 @@
+// RUN_PIPELINE_TILL: BACKEND
+// FIR_DUMP
+data class User(val name: String, val age: Int)
+
+/* GENERATED_FIR_TAGS: classDeclaration, data, primaryConstructor, propertyDeclaration */