Only update timeline when Spring Boot 4.x changes

[rujche]

Summary

• update workflow timeline logic to append a new timeline item only when Spring Boot 4.x entries change
• skip timeline update when only Spring Boot 3.x entries change
• keep timeline content limited to supported Spring Boot 4.x matrix entries

Why

• avoid noisy timeline updates for 3.x-only changes
• align timeline updates with the intended 4.x update signal

Validation

• Created PR before current PR: Update Spring Boot and Spring Cloud versions for the Spring compatibility tests azure-sdk-for-java#49640
• Created PR after current PR: Update Spring Boot and Spring Cloud versions for the Spring compatibility tests azure-sdk-for-java#49642.

[Copilot]

Pull request overview

Updates the GitHub Actions workflow that generates/updates the Spring compatibility support JSON in azure-sdk-for-java, refining the timeline update behavior so that timeline entries are only appended when Spring Boot 4.x compatibility entries change (and the timeline content lists only supported 4.x entries).

Changes:

• Add a Spring Boot 4.x–scoped diff check (old vs. new JSON) to decide whether to update the timeline.
• Restrict the timeline’s listed matrix lines to SUPPORTED entries with spring-boot-version starting with 4..
• Skip timeline updates when no supported Spring Boot 4.x entries are present.

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