[Build] Use default declarative checkout for I/Y-builds #2713
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and restore ability to define I/Y-builds jobs for other branches, only through the job definition.
This ability was lost for I-builds in #2709. For maintenance branches the
build.jenkinsfile
would have to be modified directly, like it is done for Y- and P-builds.Furthermore use the error() step instead of throwing an 'IllegalStateException' because the latter doesn't always seem to be permitted.