[MPG] interface not contains 'get' operation is not generated

[RodgeFu]

Repro:

1. generate code for computeschedule with new mpg generator
2. Check the interface ScheduledActionExtension or interface ScheduledActionResources
   Expected:

• the operation and related models should be generated properly
  Actual:
• the operation and related models are not generated

For example:

related spec:

• https://github.com/mzhongl524/azure-rest-api-specs/blob/c3c93e9102521197fffb02498222aa1c2375d69a/specification/computeschedule/ComputeSchedule.Management/routes.tsp#L271-L273

generated sdk:

• no GetAssociatedScheduledActions generated in the ComputeScheduleExtensions:
  • https://github.com/mzhongl524/azure-sdk-for-net/blob/8dbfd861a016141b2266a2520217caddafea30e4/sdk/computeschedule/Azure.ResourceManager.ComputeSchedule/src/Generated/Extensions/ComputeScheduleExtensions.cs
  • also the related models are not generated

expected sdk:

• azure-sdk-for-net/sdk/computeschedule/Azure.ResourceManager.ComputeSchedule/src/Generated/Extensions/ComputeScheduleExtensions.cs

  Line 93 in c363c60

  public static Pageable<ScheduledActionResources> GetAssociatedScheduledActions(this ArmClient client, ResourceIdentifier scope, CancellationToken cancellationToken = default)

[RodgeFu]

operation still not generated

[live1206]

created #54563 for the root cause