CI: removed the upstream tag env

Signed-off-by: ismail <mohammed.ismail@openairinterface.org>

ci-scripts/Jenkinsfile-Bracket-Test

@@ -29,9 +29,6 @@ def cn_ci_host = params.Host_CN_CI_Server
 def cn_ci_resource = params.DockerContainers
 def ds_tester_ci_resource = params.DsTester
 
-// When triggered by upstream, specify which tag to use
-def upstreamTagToUse = params.upstreamTagToUse
-
 // Location of the 2nd CN executor
 def new_host_flag = false
 def new_host = ""
@@ -128,7 +125,6 @@ pipeline {
             }
             sh "git clean -x -d -f > /dev/null 2>&1"
             sh "git fetch --prune > /dev/null 2>&1"
-            sh 'git checkout -f ' + upstreamTagToUse 
           }
           sh "mkdir -p archives DS-TEST-RESULTS"
           // Verify that the images are available