Some event ticket improvements

[ddabble]

Main changes:

• Removed EventTicket's legacy _name and _email fields (17cb55dfdfaca11fb7b5c70ac0ebe6df653f90ad)
  • It's been a few years since we started requiring being logged in when registering for an event, and so it's definitely time to remove these backup fields. (If it would ever be useful to dig up the ticket holders of old events, we have backups of the database from back then anyway 🤠)
• Event tickets are reactivated instead of recreated (9849d1467d32173af6ffd7810bba6783684672d8)
  • Previously, when non-admin users would re-register for an event after having canceled their tickets, a new, active ticket would be created, but the old, canceled ticket would remain in the database. Keeping the canceled tickets like this, is currently not being utilized by anyone in the organization, and so we stop needlessly cluttering the database with these objects.

Additional changes:

• Made users with the news.cancel_ticket permission always able to register for an event (6bc15bb7e2dcbd0d6cc98fa807da80eb4f745e87)
• Improved event ticket card templates, like displaying the ticket's language and comment (73c5e1a2285c2b3216fb8466e14b8e506c1c3b15)

[codecov[bot]]

Codecov Report

Merging #428 (cbee23f) into dev (a1ead75) will increase coverage by 0.58%. The diff coverage is 98.66%.

@@            Coverage Diff             @@
##              dev     #428      +/-   ##
==========================================
+ Coverage   87.43%   88.01%   +0.58%     
==========================================
  Files         136      137       +1     
  Lines        5142     5183      +41     
==========================================
+ Hits         4496     4562      +66     
+ Misses        646      621      -25     

Impacted Files	Coverage Δ
news/views.py	97.12% <96.00%> (+3.87%)	:arrow_up:
news/admin.py	93.49% <100.00%> (+1.23%)	:arrow_up:
news/forms.py	96.96% <100.00%> (ø)
news/models.py	98.63% <100.00%> (+2.03%)	:arrow_up:
util/model_utils.py	100.00% <100.00%> (ø)
mail/email.py	38.63% <0.00%> (+4.54%)	:arrow_up:
util/view_utils.py	96.66% <0.00%> (+5.55%)	:arrow_up:
util/logging_utils.py	100.00% <0.00%> (+33.33%)	:arrow_up:

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