feat(batch): add Batch labels job sample

[TetyanaYahodska]

Description

Fixes #

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Checklist

• [x] I have followed Sample Format Guide
• [ ] pom.xml parent set to latest shared-configuration
• [ ] Appropriate changes to README are included in PR
• [ ] 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)
• [x] Tests pass: mvn clean verify required
• [x] Lint passes: mvn -P lint checkstyle:check required
• [ ] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [ ] 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/snippets/src/main/java/com/example/batch/CreateBatchLabelJob.java:17](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/da098d4b1c72531005b83fe9fdba90682f7f6b48/batch/snippets/src/main/java/com/example/batch/CreateBatchLabelJob.java#L17), tag `batch_labels_job`

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[Sita04]

@TetyanaYahodska What's the difference between this sample and the one in https://github.com/GoogleCloudPlatform/java-docs-samples/pull/9415?

[TetyanaYahodska]

@Sita04 This example demonstrates how to apply labels to a Job and #9415 do the same for a Runnable. We have three cases in the documentation https://cloud.google.com/batch/docs/organize-resources-using-labels#gcloud_1 and so three samples are created.

[Sita04]

Please follow https://www.conventionalcommits.org/en/v1.0.0/ for PR naming.