chore: format java-firestore

[sofisl]

Uses google-java-format 1.25.2

Fixes googleapis/librarian#6012
For googleapis/librarian#6026

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• java-firestore/samples/snippets/src/main/java/com/example/firestore/Quickstart.java:82, tag firestore_setup_dataset_pt1
• java-firestore/samples/snippets/src/main/java/com/example/firestore/Quickstart.java:99, tag firestore_setup_dataset_pt2

You are about to delete 2 region tags.

• java-firestore/samples/snippets/src/main/java/com/example/firestore/Quickstart.java:83, tag firestore_setup_dataset_pt1
• java-firestore/samples/snippets/src/main/java/com/example/firestore/Quickstart.java:99, tag firestore_setup_dataset_pt2

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[gemini-code-assist]

Code Review

This pull request primarily focuses on code style and formatting improvements across several test files and a sample snippet. Key changes include reorganizing imports, reformatting Java record definitions for conciseness, adjusting indentation for better readability, and standardizing Javadoc comments. I have no feedback to provide as there were no review comments to assess.