[e2e] Tektonhubexternaldatabase testcase failing with namespace not found

Expected Behavior

Testcases should pass.

Actual Behavior

Failed with namespace not found. https://dashboard.dogfooding.tekton.dev/#/namespaces/bastion-z/pipelineruns/tekton-operator-s390x-nightly-run-h9h6q?pipelineTask=e2e-test-operator&step=run-e2e-tests

Steps to Reproduce the Problem

1. install kind based cluster
2. clone operator code
3. run ./test/e2e-test.sh

Additional Info

root@basavarg-build-vm:~# kubectl version -o yaml
clientVersion:
 buildDate: "2023-04-11T17:10:18Z"
 compiler: gc
 gitCommit: 1b4df30b3cdfeaba6024e81e559a6cd09a089d65
 gitTreeState: clean
 gitVersion: v1.27.0
 goVersion: go1.20.3
 major: "1"
 minor: "27"
 platform: linux/s390x
kustomizeVersion: v5.0.1
serverVersion:
 buildDate: "2023-06-06T12:33:20Z"
 compiler: gc
 gitCommit: 1b4df30b3cdfeaba6024e81e559a6cd09a089d65
 gitTreeState: dirty
 gitVersion: v1.27.0-dirty
 goVersion: go1.20.3
 major: "1"
 minor: 27+
 platform: linux/s390x

• Tekton Pipeline version:

  Output of tkn version or kubectl get pods -n tekton-pipelines -l app=tekton-pipelines-controller -o=jsonpath='{.items[0].metadata.labels.version}'

Failure log:

--- SKIP: TestTektonChainTutorialTestSuite (0.00s)
=== RUN   TestTektonHubTestSuite
=== RUN   TestTektonHubTestSuite/Test01_DeployDefault
2023-09-21T09:17:09.635Z	debug	common/05_tektonhubdeployment_test.go:110	removing the tekton hub cr if any
2023-09-21T09:17:09.661Z	debug	common/05_tektonhubdeployment_test.go:115	test environment ready. starting the actual test
=== RUN   TestTektonHubTestSuite/Test02_DeployWithExternalDatabase
2023-09-21T09:18:24.718Z	debug	common/05_tektonhubdeployment_test.go:110	removing the tekton hub cr if any
2023-09-21T09:18:29.773Z	debug	common/05_tektonhubdeployment_test.go:115	test environment ready. starting the actual test
2023-09-21T09:18:29.847Z	debug	common/05_tektonhubdeployment_test.go:325	wait for external database deployment becomes ready	{"namespace": "hub-external-db", "deploymentName": "tekton-hub-db"}
2023-09-21T09:19:19.867Z	debug	common/05_tektonhubdeployment_test.go:331	external database deployment is ready
    05_tektonhubdeployment_test.go:350:
        	Error Trace:	/root/go/src/github.com/tektoncd/operator/test/e2e/common/05_tektonhubdeployment_test.go:350
        	            				/root/go/src/github.com/tektoncd/operator/test/e2e/common/05_tektonhubdeployment_test.go:144
        	Error:      	Received unexpected error:
        	            	namespaces "tekton-pipelines" not found
        	Test:       	TestTektonHubTestSuite/Test02_DeployWithExternalDatabase
2023-09-21T09:19:19.938Z	info	common/05_tektonhubdeployment_test.go:123	test failed, executing debug commands	{"testName": "TestTektonHubTestSuite/Test02_DeployWithExternalDatabase"}

------------------- debug information -------------------
$ kubectl get tektonconfig