feat: allow multiple subnets in updating service endpoints

[andyzhangx]

What type of PR is this?
/kind feature

What this PR does / why we need it:
feat: allow multiple subnets in updating service endpoints

Which issue(s) this PR fixes:

Fixes #1606

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

feat: allow multiple subnets in updating service endpoints

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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• OWNERS [andyzhangx]

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[andyzhangx]

/retest

[andyzhangx]

/cherrypick release-1.30

[k8s-infra-cherrypick-robot]

@andyzhangx: cannot checkout release-1.30: error checking out "release-1.30": exit status 1 error: pathspec 'release-1.30' did not match any file(s) known to git

In response to this:

/cherrypick release-1.30

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[andyzhangx]

/cherrypick release-1.30

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #1724

In response to this:

/cherrypick release-1.30

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[andyzhangx]

/cherrypick release-1.29

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #1725

In response to this:

/cherrypick release-1.29

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.