[cps-2.10-infra] feat(server): auto cancel previous builds triggered by PR

[knight42]

What type of PR is this?

/kind feature
/area cicd

What this PR does / why we need it:

Manually backport #1552 to cps-2.10-infra.

Which issue(s) this PR is related to (optional, link to 3rd issue(s)):

Fixes #

Reference to #

Special notes for your reviewer:

/cc @zhujian7

Does this PR introduce a user-facing change?:

NONE

[zhujian7]

/cherrypick cps-2.10

[zhujian7]

/lgtm

[caicloud-bot]

@zhujian7: once the present PR merges, I will cherry-pick it on top of cps-2.10 in a new PR and assign it to you.

In response to this:

/cherrypick cps-2.10

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.

[caicloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zhujian7

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [zhujian7]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[caicloud-bot]

@zhujian7: new pull request created: #1554

In response to this:

/cherrypick cps-2.10

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.