[RBAC] Rename managed role definitions, and move migration logic here

[AlanCoding]

SUMMARY

This changes the names of the pre-created roles. Here I'll give a dump of what it produces:

In [4]: list(RoleDefinition.objects.values_list('name', flat=True))
Out[4]: 
['Project Admin',
 'Organization Project Admin',
 'Project Use',
 'WorkflowJobTemplate Admin',
 'Organization WorkflowJobTemplate Admin',
 'WorkflowJobTemplate Execute',
 'WorkflowJobTemplate Approve',
 'Inventory Admin',
 'Organization Inventory Admin',
 'Inventory Use',
 'Inventory Adhoc',
 'NotificationTemplate Admin',
 'Organization NotificationTemplate Admin',
 'JobTemplate Admin',
 'Organization JobTemplate Admin',
 'JobTemplate Execute',
 'Organization Member',
 'Organization Audit',
 'Credential Admin',
 'Organization Credential Admin',
 'Credential Use',
 'ExecutionEnvironment Admin',
 'Organization ExecutionEnvironment Admin',
 'InstanceGroup Admin',
 'Organization InstanceGroup Admin',
 'InstanceGroup Use',
 'Team Admin',
 'Organization Team Admin',
 'Team Member',
 'Organization Admin']

We would prefer not to change these later, so ideally this is final.

internal: AAP-22517

This also moves the managed role pre-create logic into here from DAB, which just seems more direct because this is the only thing that uses this.

ISSUE TYPE

• New or Enhanced Feature

COMPONENT NAME

• API

[AlanCoding]

Tests all look good. I'm good to merge this to the feature branch.