voltha-e2e voltha-scale software-upgrades: use scm and branched scripts

* use pipeline-scm to pull pipeline-script directly from ci-management
  git repository instead of parsing it via dsl
* checkout specific pipeline-branch for each pipeline definition to
  align tests with voltha release
* align voltha-scale, voltha-e2e and software-upgrades tests with
  changes done for voltha-test in gerrit change #34686 and #34682 for
  ci-management repo

Signed-off-by: Jan Klare <jan.klare@bisdn.de>
Change-Id: I28710413f7a0b1bcc6b7aa02d5196a0e7f1f50a4
Signed-off-by: Jan Klare <jan.klare@bisdn.de>
diff --git a/jjb/voltha-e2e/master.yaml b/jjb/voltha-e2e/master.yaml
index f3baff1..0710265 100644
--- a/jjb/voltha-e2e/master.yaml
+++ b/jjb/voltha-e2e/master.yaml
@@ -86,6 +86,7 @@
           # 20230828 - show in the jenkins UI but w/o updates. 
           # ---------------------------------------------------------
           pipeline-script: 'voltha/master/bbsim-tests.groovy'
+          pipeline-branch: 'master'
           time-trigger: "H H/23 * * *"         # Build daily at 11pm
 #          time-trigger: "H/30 * * * *"        # Build every 30 min
           testTargets: |
@@ -154,6 +155,7 @@
           name: 'periodic-voltha-dt-test-bbsim-master'
           build-node: 'ubuntu18.04-basebuild-4c-8g'
           pipeline-script: 'voltha/master/bbsim-tests.groovy'
+          pipeline-branch: 'master'
           code-branch: 'master'
           time-trigger: "@daily"
           testTargets: |