e2e: add testcases for upstream encryption annotations

[Xunzhuo]

Why do you need it?

annotations:

• nginx.ingress.kubernetes.io/proxy-ssl-secret
• nginx.ingress.kubernetes.io/proxy-ssl-name
• nginx.ingress.kubernetes.io/proxy-ssl-server-name

How could it be?

Add testcases for upstream encryption annotations.

Other related information

• https://github.com/alibaba/higress/tree/main/test
• https://github.com/alibaba/higress/issues/190

[Fkbqf]

please assign me