apis: add WebHook action and job lifecycle events

[chuqing1997]

Add support for WebHook action in LifecyclePolicy to enable HTTP callbacks when job state changes. This includes:

• New Events: JobTerminated, JobCompleted, JobAborted, JobFailed
• New Action: WebHook with configurable URL, method, headers, body, timeout and retries
• WebHookConfig struct for webhook configuration
• Update generated code (deepcopy, clients, etc.)
• Fix build constraint syntax in hack/tools.go for Go compatibility

This enables users to configure webhook notifications for job completion states through the existing Policies mechanism.

[volcano-sh-bot]

Welcome @chuqing1997!

It looks like this is your first PR to volcano-sh/apis.

Thank you, and welcome to Volcano. 😃

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[chuqing1997]

/assign @william-wang

[chuqing1997]

I want to implement the functionality mentioned in the issue of volcano sh/volcano # 4342. Because the Volcano repository relies on the apis repository, I made modifications to the apis first. This is my PR. Please review it.

[JesseStutler]

I want to implement the functionality mentioned in the issue of volcano sh/volcano # 4342. Because the Volcano repository relies on the apis repository, I made modifications to the apis first. This is my PR. Please review it.

You can replace your go.mod like
volcano-sh/apis => github.com/chuqing1997/apis [your commit id] and then execute go mod tidy first to test in main repo, so it will not block you to test. We will check this PR later

[volcano-sh-bot]

@chuqing1997: PR needs rebase.

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