Add per-debater opt-out from public speaker rankings

[Copilot]

Mirrors the existing per-team ranking_public opt-out mechanism for individual debaters on the public speaker rankings page.

Changes

• Debater model — adds ranking_public = models.BooleanField(default=True), matching the same field on Team
• Migration — 0037_debater_ranking_public.py
• public_speaker_rankings view — filters both varsity and novice speaker lists to exclude debaters with ranking_public=False before building the public table. Varsity speaker rankings include all speakers (both varsity and novice); novice speaker rankings include only novices.
• DebaterForm — picks up the new field automatically since it already excludes only tiebreaker

Tests

Added unit tests in mittab/libs/tests/views/test_public_views.py covering:

• A debater with ranking_public=False is excluded from varsity speaker rankings
• A novice debater with ranking_public=False is excluded from both sections
• A novice debater with ranking_public=True appears in both the varsity and novice sections
• A varsity debater does not appear in the novice section

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[JoeyRubas]

@copilot varsity speaker rankings should include varsity or novice, novice speaker rankings should be just novices

[Copilot]

@copilot varsity speaker rankings should include varsity or novice, novice speaker rankings should be just novices

Fixed in 03e96ee — the varsity section now shows all speakers (both varsity and novice), while the novice section remains novice-only. The ranking_public opt-out applies to both.

[JoeyRubas]

@copilot add unit tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.68%. Comparing base (8c5d252) to head (03e96ee).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #512      +/-   ##
==========================================
- Coverage   78.72%   78.68%   -0.05%     
==========================================
  Files         122      123       +1     
  Lines        9316     9321       +5     
==========================================
  Hits         7334     7334              
- Misses       1982     1987       +5     

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[Copilot]

@copilot add unit tests

Added 4 unit tests in eb72f2d covering:

• test_debater_ranking_public_false_excluded_from_varsity_speakers — confirms a debater appears first, then verifies they're hidden after setting ranking_public=False
• test_novice_debater_ranking_public_false_excluded_from_novice_speakers — same pattern for novice debaters, hidden from both sections
• test_novice_debater_ranking_public_true_appears_in_varsity_and_novice — verifies a novice debater's name appears in both the varsity and novice HTML sections separately
• test_varsity_debater_does_not_appear_in_novice_speakers — asserts the novice section exists, then verifies a varsity debater is absent from it