Moving tekton resources to another folder to fix sync issue caused by #488

[hakuna-matatah]

Moving tekton resources to another folder to fix sync issue caused by #488
When this file was created under assets, flux trying to apply this and failing to sync

{"level":"error","ts":"2025-03-10T20:48:46.930Z","logger":"controller.kustomization","msg":"Reconciliation failed after 68.634214ms, next try in 2m0s","reconciler group":"kustomize.toolkit.fluxcd.io","reconciler kind":"Kustomization","name":"kubernetes-iteration-toolkit","namespace":"tekton-pipelines","revision":"main/76b4d2e40becba185debc77c9cf5a815e3b22983","error":"failed to decode Kubernetes YAML from /tmp/kustomization-3721837646/tests/assets/eks_node_group_launch_template_al2023.yaml: missing Resource metadata"}

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[mengqiy]

LGTM

[mengqiy]

Providing some additional context: the flux controllers is configured to target all yaml files under tests directory. There's one yaml file that is not a k8s resource introduced in #488 under tests/assets.

Now we changed the flux controllers to only target tests/tekton-resources. As a result, it will skip tests/assets. The problem is confirmed to be fixed.