SU24 / Bug Fixes & Refactoring

[cycomachead]

• Cleanup handling of email templates
• Delete some old code/labels
• Reorg the teacher model in prep for deleting some stuff.
• add some basic EmailTemplate test cases.

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.31%. Comparing base (49575e3) to head (2019df1).

Files	Patch %	Lines
app/models/teacher.rb	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #329      +/-   ##
==========================================
+ Coverage   89.24%   89.31%   +0.06%     
==========================================
  Files          28       28              
  Lines         958      964       +6     
==========================================
+ Hits          855      861       +6     
  Misses        103      103              

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