Add pulp install scripts

Jenny Kimrequested to merge
jk/pulp-install-scripts into main

Adding pulp install scripts for gitlab-ce and gitlab-ee for pre and ops.

The difference between the packagecloud ones and these is just that they don't mention packagecloud anymore.

Reference: https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.rpm.sh and https://packages.gitlab.com/install/repositories/gitlab/gitlab-ee/script.deb.sh

Related https://gitlab.com/gitlab-org/build/team-tasks/-/issues/51

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