add service type to permission webhooks

[ChaamC]

Add the service.type data in the Webhooks for a Permission change, even if the resource is not a service,
since the root service type is necessary to Cowbird.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (63b0fb3) 80.76% compared to head (45f6085) 80.77%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #582   +/-   ##
=======================================
  Coverage   80.76%   80.77%           
=======================================
  Files          73       73           
  Lines       10160    10162    +2     
  Branches     1816     1816           
=======================================
+ Hits         8206     8208    +2     
  Misses       1630     1630           
  Partials      324      324           

Impacted Files	Coverage Δ
magpie/api/management/group/group_utils.py	90.06% <100.00%> (ø)
magpie/api/management/user/user_utils.py	97.21% <100.00%> (ø)
magpie/api/webhooks.py	85.91% <100.00%> (+0.20%)	⬆️

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[fmigneault]

Just minor formatting to adjust.