Make all email template paths configurable.

[jwag956]

• Add configuration variables for remaining email templates
• change send_mail to use template param as is - not prepend 'security/email' - allow apps to set what they want.

close #536

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.66%. Comparing base (c5c9255) to head (c45d85d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1250      +/-   ##
==========================================
- Coverage   98.66%   98.66%   -0.01%     
==========================================
  Files          43       43              
  Lines        5386     5385       -1     
==========================================
- Hits         5314     5313       -1     
  Misses         72       72              

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