.cci.jenkinsfile: disable testing on older RHCOS branch

The tests won't pass because they run with latest COSA and not the
branch specific COSA. Let's just disable them for now.

(cherry picked from commit 5be9e14)

.cci.jenkinsfile

@@ -1,70 +1,2 @@
 // Documentation: https://github.com/coreos/coreos-ci/blob/main/README-upstream-ci.md
-
-properties([
-    // abort previous runs when a PR is updated to save resources
-    disableConcurrentBuilds(abortPrevious: true)
-])
-
-// We run `kolaTestIso` which requires at least 8Gi. Add 1Gi for overhead.
-cosaPod(cpus: 4, memory: "9Gi") {
-    checkoutToDir(scm, 'config')
-
-    def basearch = shwrapCapture("cosa basearch")
-    def mechanical_streams = ['branched', 'rawhide']
-
-    shwrap("cd config && ci/validate")
-
-    shwrap("""
-        mkdir -p /srv/coreos && cd /srv/coreos
-        cosa init ${env.WORKSPACE}/config
-        python3 /usr/lib/coreos-assembler/download-overrides.py
-        # prep from the latest builds so that we generate a diff on PRs that add packages
-        cosa buildfetch --stream=${env.CHANGE_TARGET}
-    """)
-
-    // use a --parent-build arg so we can diff later and it matches prod
-    def parent_arg = ""
-    def parent_commit = ""
-    if (shwrapRc("test -e /srv/coreos/builds/latest/${basearch}/meta.json") == 0) {
-        shwrap("cp /srv/coreos/builds/latest/${basearch}/meta.json .") // readJSON wants it in the WORKSPACE
-        def meta = readJSON file: "meta.json"
-        def version = meta["buildid"]
-        parent_arg = "--parent-build ${version}"
-        parent_commit = meta["ostree-commit"]
-    }
-
-    // do a build. If we are operating on a mechanical stream then we
-    // can pin packages in lockfiles but we don't maintain a full set
-    // so we can't do a strict build.
-    def no_strict_build = false
-    if (env.CHANGE_TARGET in mechanical_streams) {
-        no_strict_build = true
-    }
-    cosaBuild(skipInit: true, noStrict: no_strict_build, extraFetchArgs: '--with-cosa-overrides', extraArgs: parent_arg)
-
-    parallel metal: {
-        shwrap("cd /srv/coreos && cosa buildextend-metal")
-    }, metal4k: {
-        shwrap("cd /srv/coreos && cosa buildextend-metal4k")
-    }
-
-    stage("Test ISO") {
-        shwrap("cd /srv/coreos && cosa buildextend-live")
-        kolaTestIso()
-    }
-
-    // also print the pkgdiff as a separate stage to make it more visible
-    if (parent_arg != "") {
-        stage("RPM Diff") {
-            shwrap("""
-                cd /srv/coreos
-                new_commit=\$(jq -r '.["ostree-commit"]' builds/latest/${basearch}/meta.json)
-                rpm-ostree db diff --repo tmp/repo ${parent_commit} \${new_commit} | tee tmp/diff.txt
-                if grep -q Downgraded tmp/diff.txt; then
-                    echo "Downgrade detected. This is likely unintentional. If not, you may safely ignore this error."
-                    exit 1
-                fi
-            """)
-        }
-    }
-}
+echo "Testing has been disabled for rhcos branches"