Upgrade to Node v20+

[Fryguy]

• manageiq-ui-classic - Update minimum node version to 20.19.1 manageiq-ui-classic#9405
• manageiq-ui-service - Update minimum node version to 20.19.1 manageiq-ui-service#1970
• manageiq-providers-cisco_intersight
• manageiq-providers-ibm_cloud
• manageiq-providers-ibm_power_vc
• manageiq-providers-lenovo
• manageiq-providers-nsxt
• manageiq-providers-nuage
• manageiq-providers-redfish
• manageiq-appliance-build
• manageiq-rpm_build
• manageiq-pods
• manageiq-cross_repo
• manageiq - (template generator)
• guides

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FWIW, this was the node 18 upgrade issue, so we should read through that for any gotchas that were found then to make sure they are covered now.