Clean up ext/ directory

There are some scripts in the ext/ directory left over from the ruby puppet master (webrick & passenger) and can be removed.

On a first look, these can be removed:

• https://github.com/puppetlabs/puppet/tree/main/ext/debian (stuff here is really old, doubt it's still being used)
• https://github.com/puppetlabs/puppet/tree/main/ext/freebsd (puppetd and puppetmasterd are no longer a thing)
• https://github.com/puppetlabs/puppet/tree/main/ext/gentoo (these are also old, and gentoo seems to vendor their own config files at https://gitweb.gentoo.org/repo/gentoo.git/tree/app-admin/puppet/files)
• https://github.com/puppetlabs/puppet/tree/main/ext/ips (not sure about this one)
• https://github.com/puppetlabs/puppet/tree/main/ext/ldap (VERY old)
• https://github.com/puppetlabs/puppet/tree/main/ext/osx
  • found references to the preflight and postflight ERBs in https://github.com/puppetlabs/packaging/blob/1.0.x/tasks/apple.rake but it appears it's been superseded by https://github.com/puppetlabs/vanagon/blob/master/lib/vanagon/platform/osx.rb (not 100% sure though, but this is what our Jenkins pipelines are using)
• https://github.com/puppetlabs/puppet/tree/main/ext/redhat (more old stuff)
• https://github.com/puppetlabs/puppet/tree/main/ext/regexp_nodes (no idea about this one)
• https://github.com/puppetlabs/puppet/tree/main/ext/solaris/smf (puppetd and puppetmasterd files and references can be removed)
• https://github.com/puppetlabs/puppet/tree/main/ext/suse (some of this may be used on SLES 11?)
• https://github.com/puppetlabs/puppet/blob/main/ext/dbfix.sql (probably not used anymore)