java-app-best-practices: Add readOnlyPropagatesToServer

[dveeden]

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[gemini-code-assist]

Summary of Changes

Hello @dveeden, I'm Gemini Code Assist¹! 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 PR enhances the java-app-best-practices.md document by adding information about the readOnlyPropagatesToServer JDBC parameter and clarifying the behavior of rewriteBatchedStatements for batch writes. It also cleans up the formatting of code blocks within the document.

Highlights

• readOnlyPropagatesToServer: Added a section explaining the readOnlyPropagatesToServer parameter and its relevance (or irrelevance) to TiDB. Disabling this parameter prevents the JDBC driver from sending SET SESSION TRANSACTION READ ONLY to the server, which is unnecessary for TiDB.
• rewriteBatchedStatements: Clarified the behavior of rewriteBatchedStatements=true for batch writes, including examples of how it concatenates values in INSERT statements and its limitations with differing INSERT statements or UPDATE statements.
• Code Block Formatting: Removed {{< copyable "sql" >}} from code blocks to improve readability.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the readOnlyPropagatesToServer JDBC parameter and removes several copyable shortcodes from the Java best practices guide. The changes are generally good. I've suggested a minor rephrasing for the new section to improve clarity and adhere to the repository's style guide by using the second person.