Replaces 'dashboard/event_filters.feature' spinach with rspec

Alexander Randarequested to merge
randaalex/gitlab-ce:23036-replace-dashboard-activity-spinach into master

What does this MR do?

Replaces 'dashboard/event_filters.feature' spinach with rspec

What are the relevant issue numbers?

#23036 (closed)

Edited by Alexander Randa

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