[Dashboard] A button to hide music room

[ArtemSBulgakov]

Describe the feature

There is a music room card shown for users who are registered in Music room. Currently the events from Music room cannot be hidden from calendar like all other groups.

Suggested solution

There should be a button on Music room card to hide the group. After clicking, it should call backend.

Additional context

The button should look like in all other event groups (eye icon).

[ArtemSBulgakov]

Three such buttons: for Music room, Sports, and Moodle