Add `jenkins_restart_method` to allow a `safe restart` to be performed. #288

Job	Run time
Lint	6s
Molecule (rockylinux9, converge.yml)	2m 39s
Molecule (ubuntu2204, converge.yml)	3m 9s
Molecule (debian11, converge.yml)	3m 16s
Molecule (ubuntu2204, http-port.yml)	2m 44s
Molecule (ubuntu2204, prefix.yml)	3m 9s
Molecule (ubuntu2204, plugins-with-home.yml)	3m 9s
Molecule (rockylinux9, jenkins-version.yml)	2m 57s
	21m 9s

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