Attachment removing process

1. Allow removing only for the person who added the attachment and the author of attachedTo doc (for example – issue) + ws Owner
2. Process of removing itself:
1. When trying to remove – show popup with confirmation and then delete completely from minio, if confirmed
2. Support removing, by creating new attribute `isRemoved` for `Attachment`. When person is removing – set it to true and don’t allow to request it from minio for anyone else rather than who created it. This way we can easily allow to restore it. But i think it will have problems with security
3. Both of the options above + in a popup show a checkbox with `Delete completely` setting