dev_admin_contestant_fix: fix contestant count that was glitching

[TheoHollender]

Fix of issue #286.

The problem was only half fixed, it seemed to come from a little bit after the annotations of the queryset, it seemed like the last annotated value would overwrite every precedent but apparently it isn't, see #346.

[codecov[bot]]

Codecov Report

Merging #347 (8c8abaa) into master (4da0c9d) will increase coverage by 0.10%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
+ Coverage   51.45%   51.56%   +0.10%     
==========================================
  Files         197      202       +5     
  Lines        9632     9647      +15     
==========================================
+ Hits         4956     4974      +18     
+ Misses       4676     4673       -3     

Impacted Files	Coverage Δ
prologin/prologin/utils/db.py	67.50% <83.33%> (+1.71%)	:arrow_up:
prologin/users/models.py	68.06% <0.00%> (-2.22%)	:arrow_down:
prologin/users/admin.py	100.00% <0.00%> (ø)
prologin/users/tests.py	100.00% <0.00%> (ø)
prologin/users/oidc_scopes.py
prologin/users/oidc_authz.py
...ologin/users/migrations/0007_openidclientpolicy.py
prologin/oidc_policy/admin.py	100.00% <0.00%> (ø)
prologin/oidc_policy/oidc_scopes.py	0.00% <0.00%> (ø)
prologin/oidc_policy/tests.py	100.00% <0.00%> (ø)
... and 7 more

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[TheoHollender]

The problem was from the db.py cause a local variable was beeing overwritten while beeing usefull to a function #346

[cyril-amar]

Can this be merged? It would participate to close #286 and #346.

[juli0z]

Migrated to https://gitlab.com/prologin/concours/site/-/merge_requests/347