convert fullstack ghprb PR test job to prow job

This commit:
 - Configures both the PR and the periodic fullstack jobs to use the
   dynamic pipeline script.
 - Adds Prow specific parameters for both the PR and periodic fullstack
   test jjbs.
 - Removes the IPA_REF parameter from both the PR and the periodic fullstack
   jobs as that parameter will have no role in the future in the IPA building.

Notes:
 - The PR fullstack test is planned to be triggered by Prow.

Signed-off-by: Adam Rozman <adam.rozman@est.tech>
Change-Id: I322a9442ea5e5beb861cc94ea200f36548dfad9b
diff --git a/jjb/metal3/projects.yml b/jjb/metal3/projects.yml
index f89e3f3..0423fdf 100644
--- a/jjb/metal3/projects.yml
+++ b/jjb/metal3/projects.yml
@@ -66,7 +66,7 @@
       org: "metal3-io"
       name: "project-infra"
     jobs:
-    - fullstack_project-infra_building
+    - fullstack_project_infra_building_test_prow
     - periodic_fullstack_building
 
 - project: