Cannot manage invitation when on waiting list

Description of the issue 📄

When you are on the waiting list for a workshop, you cannot manage your invitation and cancel the RSVP.

Screenshots 📷

Current behaviour

When you are on the main list and you go back, you see a "Manage your invitation" button:

When you click on it, you can cancel your RSVP by clicking "I can no longer attend":

However, when you are on the waiting list, the button still says "Attend as a coach" even though you're on the waiting list and clicking on it reminds you that you are registered but doesn't allow you to cancel your RSVP:

Expected behaviour

When you are on the waiting and you go to the event page, you should have the same "Manage your invitation" button that takes you to the page where you can manage your RSVP.

Steps to fix 🛠

To do 📋

• Claim this issue (comment below, or assign yourself if you are part of the codebar org)
• Fork and clone the repository
• Update the relevant files. Follow the steps to fix section in this issue.
• Commit your changes as one commit. Use the title of this issue as your commit message
• Submit a pull request
• Mention this issue in the PR description by including it's number
• Have your pull request reviewed & merged by a codebar team member

Start from the event page's invitation controls and trace how the waiting-list RSVP state selects the displayed button. Compare that path with the main-list "Manage your invitation" flow; done means waiting-list attendees can reach the RSVP management page and cancel their RSVP.