Reason to denial reason

[ArushC]

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What this PR does:

Replace the "reason" parameter with "denial_reason". Also updates the name of all relevant instance variables and attributes from "reason" to "denial_reason" to avoid confusion in the code, except in the one case where the @ reason instance variable was being used both for the denial reason and the more information request reason (not implemented yet)—here, I added a new instance variable @reason_request for the more information request in the relevant controller to pass along the information.

IMPORTANT: to reflect the changes in the denial email template (changing {reason} to {denial reason}), either the email template database should be reseeded or the template should be edited manually through the web interface. Simply change reason->denial_reason.

This pull request fixes|implements (pick one...) ______.

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How should this PR be tested?

• Is there a deploy we can view?
• What do the specs/features test?
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Checklist:

• Has this been deployed to a staging environment or reviewed by a customer?
• Tag someone for code review (either a coach / team member)
• I have renamed the branch to match PivotTracker's suggested one (necessary for BlueJay) (e.g. michael/12345-add-new-feature Any branch name will do as long as the story ID is there. You can use git checkout -b [new-branch-name])

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d35ca2c) 81.95% compared to head (092cce2) 81.95%.

Files	Patch %	Lines
app/controllers/teachers_controller.rb	50.00%	1 Missing ⚠️
app/mailers/teacher_mailer.rb	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #28   +/-   ##
=======================================
  Coverage   81.95%   81.95%           
=======================================
  Files          20       20           
  Lines         654      654           
=======================================
  Hits          536      536           
  Misses        118      118           

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