feat: Make higress-core and higress-gateway as the default container

[CH3CHO]

Ⅰ. Describe what this PR did

Make higress-core and higress-gateway as the default container, so it would be easier for users to run kubectl logs and kubectl exec commands.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

Q: Why don't I use the kubectl.kubernetes.io/default-container mentioned here (https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/2227-kubectl-default-container/README.md)?

A: Although we get almost the same result after adding this annotation, the first line output, Defaulted container "higress-core" out of: higress-core, discovery will disappear, making users more difficult to know all the container names.

[fengxsong]

I thing annotations can do that thick, ref: https://kubernetes.io/docs/reference/labels-annotations-taints/#kubectl-kubernetes-io-default-container

[CH3CHO]

I thing annotations can do that thick, ref: https://kubernetes.io/docs/reference/labels-annotations-taints/#kubectl-kubernetes-io-default-container

I'm aware of this. Please check out my explanation in "Ⅴ. Special notes for reviews" and let me know what do you think. Thanks. @fengxsong

[cr7258]

LGTM🐉

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.11%. Comparing base (ef31e09) to head (5fcd1f7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1144      +/-   ##
==========================================
+ Coverage   35.91%   36.11%   +0.20%     
==========================================
  Files          69       69              
  Lines       11576     9464    -2112     
==========================================
- Hits         4157     3418     -739     
+ Misses       7104     5730    -1374     
- Partials      315      316       +1     

see 67 files with indirect coverage changes