fix: remove liaison_contact and liaison_cc_contact Role objects

[rjsparks]

No description provided.

[rjsparks]

cc: @mirjak (focus on migratiaon 0006 (i.e. bdd4962), the commit with 0005 is only here at the moment to promote expedient review)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.80%. Comparing base (97c9eeb) to head (bdd4962).
Report is 24 commits behind head on feat/liaisons.

Additional details and impacted files

@@              Coverage Diff               @@
##           feat/liaisons    #8920   +/-   ##
==============================================
  Coverage          88.80%   88.80%           
==============================================
  Files                314      314           
  Lines              41419    41419           
==============================================
  Hits               36782    36782           
  Misses              4637     4637           

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[jennifer-richards]

cc: @mirjak (focus on migratiaon 0006 (i.e. bdd4962), the commit with 0005 is only here at the moment to promote expedient review)

n.b., the other PR has been merged so this comment is stale - the 0005 migration Robert referred to no longer shows up in the diff for this PR.