test: Remove `time.Sleep` and replace with wait.poll

[AlinsRan]

background

In the current project's e2e, a lot of time.sleep is used. This will undoubtedly increase the overall time-consuming of CI.

https://pkg.go.dev/k8s.io/apimachinery/pkg/util/wait package provides tools for polling or listening for changes to a condition.

We can replace the current time.sleep with wait for a more elegant way of determining whether our desired state has been reached.

To do list:

• [ ] suite-annotations
• [ ] suite-ingress
  • [x] suite-ingress-resource #1128
  • [ ] suite-ingress-features
• [ ] suite-plugins
  • [ ] suite-plugins-authentication
  • [ ] suite-plugins-general
  • [ ] suite-plugins-other
  • [ ] suite-plugins-security
  • [ ] suite-plugins-traffic
  • [ ] suite-plugins-transformation
• [ ] suite-features