Ensure Tekton is ready when installing ODS Pipeline in tests

[michaelsauter]

See opendevstack/ods-pipeline-tkn@456db5d. This was necessary to fix errors like this one:

Error: 2 errors occurred:
	* Internal error occurred: failed calling webhook "webhook.pipeline.tekton.dev": failed to call webhook: Post "[https://tekton-pipelines-webhook.tekton-pipelines.svc:443/defaulting?timeout=10s](https://tekton-pipelines-webhook.tekton-pipelines.svc/defaulting?timeout=10s)": dial tcp 10.96.185.57:443: connect: connection refused
	* Internal error occurred: failed calling webhook "webhook.pipeline.tekton.dev": failed to call webhook: Post "[https://tekton-pipelines-webhook.tekton-pipelines.svc:443/defaulting?timeout=10s](https://tekton-pipelines-webhook.tekton-pipelines.svc/defaulting?timeout=10s)": dial tcp 10.96.185.57:443: connect: connection refused

See https://github.com/opendevstack/ods-pipeline-tkn/actions/runs/6743404129/job/18336502457