JENKINS-66189 Use dynamic DSL instead of outdated PostBuildScript syntax

[dheid]

Hi @daspilker!

A user complained in https://issues.jenkins.io/browse/JENKINS-66189 that his Job DSL generated PostBuildScript configuration fails. That's because I removed some deprecated configuration options in version 3.x and forgot that there is a non-dynamic DSL in the Job DSL plugin.

To be sure, no one uses the old syntax any longer, please let us remove the entries from the Job DSL plugin. I removed them in this pull request.

Best regards

Daniel

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[dheid]

@jamietanna Ping

[dheid]

@daspilker I think it's a good thing to remove the old PostBuildScript stuff. It damages the configuration of the users.

[dheid]

@jamietanna Are you there?

[dheid]

@jamietanna How are you doing?

[jamietanna]

Hey @dheid thanks for this, this looks like a reasonable change. Just to confirm, have you seen if the Dynamic DSL picks up all the options for the plugin that we'd want?

[dheid]

@jamietanna Yes, it includes everything

[jamietanna]

Looks good, appreciate you doing this!

I'll get this released today + add an appropriate warning in the CHANGELOG