[AutoPR eventhub/resource-manager] Event Hub: Added missing API to respective API version Swaggers

[AutorestCI]

Created to sync Azure/azure-rest-api-specs#2457

[codecov-io]

Codecov Report

Merging #1944 into restapi_auto_eventhub/resource-manager will decrease coverage by <.01%.
The diff coverage is 53.39%.

@@                            Coverage Diff                             @@
##           restapi_auto_eventhub/resource-manager    #1944      +/-   ##
==========================================================================
- Coverage                                   53.15%   53.15%   -0.01%     
==========================================================================
  Files                                        4724     4730       +6     
  Lines                                      117181   117283     +102     
==========================================================================
+ Hits                                        62293    62347      +54     
- Misses                                      54888    54936      +48

Impacted Files	Coverage Δ
...azure/mgmt/eventhub/event_hub_management_client.py	100% <100%> (ø)	⬆️
azure-mgmt-eventhub/azure/mgmt/eventhub/version.py	100% <100%> (ø)	⬆️
...mt-eventhub/azure/mgmt/eventhub/models/__init__.py	100% <100%> (ø)	⬆️
...venthub/azure/mgmt/eventhub/operations/__init__.py	100% <100%> (ø)	⬆️
...ure/mgmt/eventhub/operations/regions_operations.py	37.5% <37.5%> (ø)
...t/eventhub/operations/messaging_plan_operations.py	43.33% <43.33%> (ø)
...nthub/azure/mgmt/eventhub/models/messaging_plan.py	50% <50%> (ø)
...mt/eventhub/models/messaging_regions_properties.py	62.5% <62.5%> (ø)
...ub/azure/mgmt/eventhub/models/messaging_regions.py	71.42% <71.42%> (ø)
...re/mgmt/eventhub/models/messaging_regions_paged.py	80% <80%> (ø)
... and 6 more

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[lmazuel]

Broken PR