Add Duo pro bulk assigning users service

What does this MR do and why?

This MR addresses bulk Duo Pro user assignments:

1. Add a service for bulk assigning users to Duo Pro
2. Implements early return for insufficient seats (NOT_ENOUGH_SEATS error).
3. Introduces fast-fail for invalid user IDs (INVALID_USER_ID_PRESENT error).
4. Aligns with the agreed-upon approach for consistency !146104 (comment 1808949111), maintaining a consistent all or none approach.

Success Response:

Click to expand

<ServiceResponse:0x000000028cd7b908
 @http_status=:ok,
 @message=nil,
 @payload=
  {:users=>
    [#<User id:12906 @code_suggestions_user1>,
     #<User id:12907 @code_suggestions_user2>,
     #<User id:12908 @code_suggestions_user3>,
     #<User id:12909 @code_suggestions_user4>,
     #<User id:12910 @code_suggestions_user5>,
     #<User id:12911 @code_suggestions_user6>,
     #<User id:12912 @code_suggestions_user7>,
     #<User id:12913 @code_suggestions_user8>,
     #<User id:12914 @code_suggestions_user9>,
     #<User id:12915 @code_suggestions_user10>,
     #<User id:12916 @code_suggestions_user11>,
     #<User id:12917 @code_suggestions_user12>,
     #<User id:12918 @code_suggestions_user13>,
     #<User id:12919 @code_suggestions_user14>,
     #<User id:12920 @code_suggestions_user15>,
     #<User id:12921 @code_suggestions_user16>,
     #<User id:12922 @code_suggestions_user17>,
     #<User id:12923 @code_suggestions_user18>,
     #<User id:12924 @code_suggestions_user19>,
     #<User id:12925 @code_suggestions_user20>]
 @reason=nil,
 @status=:success>

No enough seats Response:

Click to expand

#<ServiceResponse:0x00000002957f4080
 @http_status=nil,
 @message=
  "NOT_ENOUGH_SEATS",
 @payload={},
 @reason=nil,
 @status=:error>

OR

#<ServiceResponse:0x00000002957f4080
 @http_status=nil,
 @message=
  "INVAILD_USER_ID_PRESENT",
 @payload={},
 @reason=nil,
 @status=:error>

Related to #442284