[FC-0099] fix: change collaborator to contributor

[MaferMazu]

Description

This PR only changes collaborator to contributor.

Related backend PR: openedx/openedx-authz#92
Merged doc about it: https://openedx-authz.readthedocs.io/en/latest/concepts/core_roles_and_permissions/content_library_roles.html

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[MaferMazu]

I think we should merge this after merging openedx/openedx-authz#92

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.71%. Comparing base (c5cab49) to head (8025e91).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #15   +/-   ##
=======================================
  Coverage   90.71%   90.71%           
=======================================
  Files          19       19           
  Lines         183      183           
  Branches       23       19    -4     
=======================================
  Hits          166      166           
  Misses         17       17           

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[sarina]

openedx/openedx-authz#92 is merged and this is good to me, @brian-smith-tcril could you take a quick look and merge?

[dcoa]

LGTM

[arbrandes]

+1