E2E: Fix Group audit log specs and update filter_group wait logic

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Related to #396908 (closed)

Fix Govern Group for add group behaves like audit event logs audit events for UI operations spec.

When a group has multiple subgroups, the newly added sub-group is not guaranteed to be on the first page. This MR adds code to search for the group.

It also updates the filter_group to wait for the spinner first before calling wait_for_requests. The reason is that the spinner doesn't appears on the page right away and the has_no_css? used in finished_loading? will return true as soon as it doesn't find the spinner. As a result, the code moves on without actually waiting for the spinner to go away.

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