feat: add Cloud Run samples for Java25

[maigovannon]

Description

Creating Java25 doc samples for Cloud Run and updating some of the existing ones to Java21. These changes are forked from the bigger PR https://github.com/GoogleCloudPlatform/java-docs-samples/pull/10193

Checklist

• [x] I have followed Sample Format Guide
• [x] pom.xml parent set to latest shared-configuration
• [x] Appropriate changes to README are included in PR
• [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

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 3 region tags.

• run/helloworld-source/pom.xml:84, tag cloudrun_helloworld_jib
• run/helloworld-source/src/main/java/com/example/helloworld/HelloworldApplication.java:17, tag cloudrun_helloworld_service
• run/helloworld-source/src/main/resources/application.properties:14, tag cloudrun_helloworld_properties

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[gemini-code-assist[bot]]

Summary of Changes

Hello @maigovannon, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new 'Hello World' sample application built with Spring Boot, designed for deployment on Google Cloud Run using source-based builds. This addition aims to provide a clear, runnable example for developers looking to get started with Java applications on Cloud Run. Concurrently, an existing Maven project's compiler settings have been updated to support a newer Java version.

Highlights

• New Cloud Run Sample: A new 'Hello World' Spring Boot application sample has been added, demonstrating how to deploy a Java application to Cloud Run using source-based deployment. This includes a README, Maven configuration, the main application class, properties, and a test.
• Maven Compiler Version Update: The Maven compiler target and source versions in the existing run/helloworld/pom.xml have been updated from Java 17 to Java 25, aligning the project with a newer Java development environment.

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