fix: Re-add ldapdb for ghes team creation

[stevehipwell]

This PR re-adds the LDAPDN field to the CreateTeamRequest struct for usage by gitHub Enterprise Server. This Field was incorrectly removed in #4446.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.57%. Comparing base (440bc88) to head (b838c57).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4553   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files         197      197           
  Lines       18252    18252           
=======================================
  Hits        17991    17991           
  Misses        261      261           

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[gmlewis]

Thank you, @stevehipwell!
LGTM.
Merging.