WIP: Upgrade to Spring Boot 4.0.0-RC1 and refactor imports for consistency #7867
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What type of PR is this?
/kind improvement
/kind api-change
/area core
/area plugin
/milestone 2.22.x
What this PR does / why we need it:
This PR tries to upgrade to Spring Boot 4.0.0-RC1 according the migration document.
We have to ensure the changes are back-compatible and try our best to introduce the least break changes for plugins.
Does this PR introduce a user-facing change?