Duplication of ticket responses

[sei-bstein]

A user reported that their responses on a ticket were being duplicated. (Ticket ID shared internally).

[sei-bstein]

Currently attributing this to multiple clicks of the form submit button on the ticket form, since we haven't found any other repro. We can address this issue by disabling the button after form submit, as we typically do.

[sei-bstein]

To handle accidental duplicate submissions from users (either through manual aware or network hiccups), we'll also allow Support users to delete ticket activity (both their own and from the submitting users). Tracking that need in #166.

[sei-bstein]

Resolved in 3.15.0.