Map navigator.userActivation tests to web-features (#46029)

diff --git a/html/user-activation/WEB_FEATURES.yml b/html/user-activation/WEB_FEATURES.yml
new file mode 100644
index 0000000..4104016
--- /dev/null
+++ b/html/user-activation/WEB_FEATURES.yml
@@ -0,0 +1,3 @@
+features:
+- name: user-activation
+  files: "**"