FIR IDE: move analysis api fir testdata to the analysis directory

analysis/analysis-api/testData/referenceResolve/forLoopIn/inLibrary/extension.kt

@@ -0,0 +1,3 @@
+fun main() {
+  for (i <caret>in "") {}
+}

analysis/analysis-api/testData/referenceResolve/forLoopIn/inLibrary/extension.txt

@@ -0,0 +1,4 @@
+Resolved to:
+0: (in kotlin.collections.CharIterator) operator fun next(): kotlin.Char
+1: (in kotlin.collections.Iterator) operator fun hasNext(): kotlin.Boolean
+2: (in kotlin.text) operator fun kotlin.CharSequence.iterator(): kotlin.collections.CharIterator