Migrate to Spring Boot's Cloud Native Buildpack support.

[mshima]

Overview of the feature request

We use jib for docker support, would be nice to move to Cloud Native Buildpacks.

There a discussion in #26527

Recent issues with jib like spring-devtools and spring-boot-compose made me realize we need to move to Cloud Native Buildpacks.

I’ve implemented #27348 which switches CI to Buildpacks.
But made realize there is no way to support both due to healthcheck changes. Unless we customize jib to add healthcheck matching Buildpacks one.

Pros:

• official Spring Boot support
• out of the box arm64 support (without custom script)
• features like CDS
• no spring devtools workaround
• no spring boot compose workaround

cons:

• slower
• Spring Boot only

And we do have jib instructions harcoded everywhere like deployment generators.

Migration consists in:

• move npm scripts from postInstall to preparing application.
• templates should read from npm scripts instead of hardcoded.
• keep jib generator for micronaut support
• maybe allow existing applications to keep jib?

Motivation for or Use Case

Related issues or PR

• Checking this box is mandatory (this is just to show you read everything)