Enrollment Exclusions: Consider org roles

[rgalanakis]

Enrollment exclusions connected to a role will
cascade that exclusion to organizations which have the role (not just members).

This allows us to 'hide' a program from everyone who has membership in a organization with a particular role.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.81%. Comparing base (996b618) to head (7e7c6fb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #898   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files         700      700           
  Lines       34113    34133   +20     
=======================================
+ Hits        34050    34070   +20     
  Misses         63       63           

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