Add issue export from group issue overview

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Proposal

Currently, it is possible to export the current issue view in a project as CSV, and receive the result per mail. It would be very convenient to also have this available for the group issue overview.

Project issue list buttons

Taken from https://gitlab.com/gitlab-org/gitlab/-/issues, support issue export.

Group options

Taken from https://gitlab.com/groups/gitlab-org/-/issues, does not support issue export