* Java 25 upgrade guide with best practices (Java 21 -> 25)
Added a description for the Java upgrade guide.
* Add Java Development Collection and Upgrade Guides
- Created a new collection for Java development, including prompts and instructions for Spring Boot, Quarkus, JPA, JUnit, and Javadoc.
- Added comprehensive markdown documentation for upgrading from Java 17 to Java 21, detailing new language features, API changes, and best practices.
- Introduced upgrade guide for transitioning from Java 21 to Java 25, highlighting new features, migration strategies, and performance considerations.
* Update upgrade guide headers and descriptions for Java 21 to 25
* Refactor Java Development Collection: Update Upgrade Guides with Descriptions
* Add Java 11 to Java 17 Upgrade Guide with best practices and migration patterns
* Rename files
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