feat: create job with notification sample

[BigBlackWolf]

Description

Fixes #

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Checklist

• [ ] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [ ] Tests pass: go test -v ./.. (see Testing)
• [ ] Code formatted: gofmt (see Formatting)
• [ ] Vetting pass: go vet (see Formatting)
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [ ] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [batch/create_with_notification.go:17](https://github.com/GoogleCloudPlatform/golang-samples/blob/b1105451d6abac3e0cea804d2d63df43a5162966/batch/create_with_notification.go#L17), tag `batch_notifications`

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[BigBlackWolf]

@muncus could you please enable API for a Batch in a test project?