feat(firestore): add firestore recursive delete sample

[alarconesparza]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• 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)
• Tests pass: mvn clean verify required
• 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

[gemini-code-assist]

Code Review

This pull request introduces a new Java sample for recursively deleting Firestore collections, including the necessary Maven configuration, an integration test, and a utility class. Feedback focuses on improving resource management by using try-with-resources for Firestore instances, ensuring test stability by correctly restoring System.out, and maintaining assertion consistency by using JUnit 5 throughout the integration test.

[gemini-code-assist]

Mixing JUnit 4 and JUnit 5 assertions is discouraged. Since this test uses JUnit 5 (@Test, @BeforeAll), please use the JUnit 5 Assertions class for all assertions.

Suggested change

	import static org.junit.Assert.assertTrue;
	import static org.junit.jupiter.api.Assertions.assertTrue;

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• firestore/samples/src/main/java/com/example/firestore/DeleteCollection.java:19, tag firestore_data_delete_collection

---

This comment is generated by snippet-bot.
If you find problems with this result, please file an issue at:
https://github.com/googleapis/repo-automation-bots/issues.
To update this comment, add snippet-bot:force-run label or use the checkbox below:

• Refresh this comment