Rename test data folder according to the new test naming convention.

compiler/testData/loadJava/vararg/VarargInt.java

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+package test;
+
+public class VarargInt {
+    public void vararg(int... p) {}
+}

compiler/testData/loadJava/vararg/VarargInt.kt

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+package test
+
+public open class VarargInt() : java.lang.Object() {
+    public open fun vararg(vararg p0: Int): Unit = #()
+}

compiler/testData/loadJava/vararg/VarargInt.txt

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+namespace test
+
+public open class test.VarargInt : java.lang.Object {
+    public final /*constructor*/ fun <init>(): test.VarargInt
+    public open fun vararg(/*0*/ vararg p0: jet.Int /*jet.IntArray*/): jet.Tuple0
+}

compiler/testData/loadJava/vararg/VarargString.java

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+package test;
+
+public class VarargString {
+    public void vararg(String... strings) {}
+}

compiler/testData/loadJava/vararg/VarargString.kt

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+package test
+
+public open class VarargString() : java.lang.Object() {
+    public open fun vararg(vararg p0: String?): Unit = #()
+}

compiler/testData/loadJava/vararg/VarargString.txt

@@ -0,0 +1,6 @@
+namespace test
+
+public open class test.VarargString : java.lang.Object {
+    public final /*constructor*/ fun <init>(): test.VarargString
+    public open fun vararg(/*0*/ vararg p0: jet.String? /*jet.Array<jet.String?>*/): jet.Tuple0
+}