[GRaphRbac] add_prop + discriminator

[AutorestCI]

Generated from RestAPI PR: Azure/azure-rest-api-specs#2169

[lmazuel]

Includes #1599

[lmazuel]

Fix #1359

[codecov-io]

Codecov Report

Merging #1724 into master will decrease coverage by 0.64%.
The diff coverage is 50.5%.

@@            Coverage Diff             @@
##           master    #1724      +/-   ##
==========================================
- Coverage   53.49%   52.85%   -0.65%     
==========================================
  Files        4461     4683     +222     
  Lines      107580   115811    +8231     
==========================================
+ Hits        57555    61208    +3653     
- Misses      50025    54603    +4578

Impacted Files	Coverage Δ
...phrbac/models/key_credentials_update_parameters.py	71.42% <0%> (-11.91%)	⬇️
...c/models/password_credentials_update_parameters.py	71.42% <0%> (-11.91%)	⬇️
...re-graphrbac/azure/graphrbac/models/graph_error.py	63.63% <0%> (-6.37%)	⬇️
...re/graphrbac/operations/applications_operations.py	24.76% <10%> (-3.65%)	⬇️
...re-graphrbac/azure/graphrbac/models/application.py	100% <100%> (ø)	⬆️
azure-graphrbac/azure/graphrbac/models/__init__.py	100% <100%> (ø)	⬆️
azure-graphrbac/azure/graphrbac/models/user.py	100% <100%> (ø)	⬆️
...c/azure/graphrbac/models/user_create_parameters.py	100% <100%> (ø)	⬆️
...aphrbac/azure/graphrbac/models/directory_object.py	100% <100%> (ø)
.../azure/graphrbac/models/group_create_parameters.py	100% <100%> (ø)	⬆️
... and 1490 more

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[AmudhaPalani]

Can you please let me know when this will be merged into Azure:master? We are waiting for this fix.

[lmazuel]

@AmudhaPalani let's release it today