Extend `JRE` enum to support Java 22

[sbrannen]

Overview

Java 22 early access builds are already available.

Deliverables

• Extend the JRE enum with a new JAVA_22 constant.
• Update EnabledOnJreIntegrationTests, DisabledOnJreIntegrationTests, EnabledOnJreConditionTests, and DisabledOnJreConditionTests accordingly.
• Document in Release Notes.