I should be able to delete a timeline item

[FelixMalfait]

Sometimes it's frustrating that we aren't able to delete an activity in the timeline. We should be able to do it.

Example:

[ehconitin]

@Bonapara where should the delete button placed?
@FelixMalfait this would be a simple delete right? Delete the corresponding timelineActivity?

[Bonapara]

I think we should wait to see if #7283 solves the issue.

[ehconitin]

I will have a look into #7283, thanks!