Default capi and capm3 versions in scalability test

Change-Id: If89a3f5b6e9099f5a15143207d517e75f355ff5d
diff --git a/jjb/metal3/projects.yml b/jjb/metal3/projects.yml
index f89e3f3..6d3657f 100644
--- a/jjb/metal3/projects.yml
+++ b/jjb/metal3/projects.yml
@@ -541,6 +541,8 @@
     - capm3_e2e_scalability_tests:
         capm3_target_branch:
         - main:
+            capi_version: v1beta1
+            capm3_version: v1beta1
             capm3_release_branch: main
             bmo_release_branch: main
             target_branches: