fix: improve api key delete form validation and tests

[rjsparks]

No description provided.

[codecov]

Codecov Report

Merging #5236 (8f2f050) into main (0ec1264) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5236      +/-   ##
==========================================
- Coverage   88.58%   88.58%   -0.01%     
==========================================
  Files         295      294       -1     
  Lines       40114    40084      -30     
==========================================
- Hits        35534    35507      -27     
+ Misses       4580     4577       -3     

Impacted Files	Coverage Δ
ietf/doc/mails.py	96.20% <100.00%> (ø)
ietf/group/views.py	90.95% <100.00%> (+0.09%)	⬆️
ietf/ietfauth/views.py	92.12% <100.00%> (+1.09%)	⬆️
ietf/meeting/helpers.py	89.84% <100.00%> (-0.07%)	⬇️
ietf/utils/text.py	85.97% <0.00%> (-1.22%)	⬇️
ietf/iesg/views.py	92.53% <0.00%> (-0.71%)	⬇️
ietf/meeting/models.py	86.03% <0.00%> (-0.05%)	⬇️
ietf/doc/views_search.py	89.25% <0.00%> (ø)
ietf/secr/proceedings/reports.py
ietf/meeting/views.py	91.13% <0.00%> (+<0.01%)	⬆️
... and 4 more

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