[DOCS]: Add screenshot of contact activity feed with UTM tags

[RCheesley]

Description

See TODO in https://github.com/mautic/user-documentation/pull/712/changes#diff-0882b6b591f25ad1e2c604a9cb44c44b887fd9ac2fd25df6ff7730cf90001831R61:

.. TODO: add screenshot - Contact timeline showing a "UTM tags recorded" entry with populated UTM fields and a FORMID reference

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