Remove JetBrains annotations dependency from Spring AOT module #4997

Summary

spring-aot declares org.jetbrains:annotations but the only production use is @NotNull on the beanFactory parameter in KubernetesBeanFactoryInitializationAotProcessor.processAheadOfTime. The annotation can be removed (or replaced with an already available Spring annotation if required), allowing the direct dependency to be dropped.

Scope

• Remove the single JetBrains @NotNull use from the Spring AOT processor.
• Remove org.jetbrains:annotations from spring-aot/pom.xml and related dependency management if no longer needed elsewhere.
• Verify the Spring AOT module compiles and its tests/build pass.