WIP: Upgrade to Spring Boot 4.0.0-RC1 and refactor imports for consistency

[JohnNiang]

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?

升级至 Spring Boot 4.0.0

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarqubecloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
9 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[JohnNiang]

Superseded by #8291.

/close

[f2c-ci-robot]

@JohnNiang: Closed this PR.

Details

In response to this:

Superseded by #8291.

/close

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