Extract for info from Jenkinsfile and support different layout

[jonesbusy]

Extract full platform information from Jenkinsfile and detect default values according to https://github.com/jenkins-infra/pipeline-library (including useContainerAgent or forkCount)

The only missing is the 'jenkinsVersion' that some plugin decide to override instead of using the default from the pom. I will add it on an other PR

This is also some preparation for #531 in order to keep the current config but migrate to new format. Or adding, removing JDK. Or removing extra jenkinsVersion or limit matrix size (for example 2 or 3 if necessary) to save compute resource

For example

buildPlugin()

will have JDK8 on Linux and Windows

Or

buildPlugin(
   jdkVersions: [21, 17]
)

Will have Java 17 and 21 on Linux and Windows

This is some preparation to convert to the "new" format

buildPlugin(
  configurations: [
        [platform: 'linux', jdk: 21],
        [platform: 'windows', jdk: 17],
  ]
)

Testing done

Mainly automated tests

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue