Move iree/samples/ -> samples/ (#8958)

Progress on #8958
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8dbf9b8..5921cd7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -636,10 +636,6 @@
   add_subdirectory(iree/compiler)
 endif()
 
-if(IREE_BUILD_SAMPLES)
-  add_subdirectory(iree/samples)
-endif()
-
 add_subdirectory(iree/tools)
 
 if(IREE_BUILD_TRACY)
@@ -704,3 +700,6 @@
 # many things into top-level APIs). This should resolve once we finish
 # relayering everything.
 add_subdirectory(runtime)
+if(IREE_BUILD_SAMPLES)
+  add_subdirectory(samples)
+endif()