Add UPC monopole skim for 2024 PbPb

[stahlleiton]

PR description:

This PR adds a new skim for UPC monopoles to be used on the 2024 PbPb HIForward PDs.

@mandrenguyen

PR validation:

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

To be backported to 14_1_X