Use stage item inputs instead of teams

[evroon]

A match should contain two stage item inputs that oppose each other, instead of two teams. This simplifies a lot and is more logical.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
bracket	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 22, 2024 3:15pm

[codecov]

Codecov Report

Attention: Patch coverage is 96.02649% with 6 lines in your changes missing coverage. Please review.

Project coverage is 93.29%. Comparing base (4c77a32) to head (ab04b1b).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
backend/bracket/models/db/match.py	89.65%	3 Missing ⚠️
...ckend/bracket/logic/scheduling/upcoming_matches.py	71.42%	2 Missing ⚠️
backend/bracket/logic/ranking/elo.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #909      +/-   ##
==========================================
+ Coverage   93.13%   93.29%   +0.16%     
==========================================
  Files         112      112              
  Lines        3888     3847      -41     
==========================================
- Hits         3621     3589      -32     
+ Misses        267      258       -9     

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