[E2E Enhancement] Use kmeshctl to manage waypoints

[YaoZengzeng]

What would you like to be added:

Now we have cli tool kmeshctl and its subcommand kmeshctl waypoint can be used to manage waypoints.

Currently in E2E tests, the gateway API is still direclty called to manage waypoints (https://github.com/kmesh-net/kmesh/blob/main/test/e2e/main_test.go#L274). In fact the code is repeated with kmeshctl waypoint, so we can direcly call kmeshctl waypoint to manage it.

Why is this needed:

Avoid code redundancy

[pratikgitss]

hey @YaoZengzeng can you please assign me this issue!

[hzxuzhonghu]

/assign @pratikgitss