Fixes wrongly pluralized command names (#1899)

* Fetch OpenAPI docs with Singularized operationIds.

* Singularize directives.

* Add singularized OpenAPI docs

* Update custom commands in Groups module

* Update managed tenants directives

* Update people directives

* Exclude duplicate authentication strengths path

* Update Applications module directives

* Fix GroupLifecyclePolicyByGroup command

* Refresh OpenAPI docs

* Update Identity.Governance directives

* Update directives

* Refresh openAPI docs

* Lock AutoREST.PowerShell to v3

* Update directives in People module

* Update directives in applications.

* Update directives in Identity.Governance.

* Update custom commands in Groups.

* Update custom commands in ManagedTenants.

* Update directives in Teams module.

* Rename Invoke-MgDetailReportManagedDeviceEnrollmentFailure

* Fix delta singularization.

* Pluralizes known products.

* Update sites directives.

Author: peombwa

openApiDocs/beta/Applications.yml

@@ -15,7 +15,7 @@ paths:
       externalDocs:
         description: Find more info here
         url: https://docs.microsoft.com/graph/api/subscription-list?view=graph-rest-1.0
-      operationId: subscriptions.subscription_ListSubscription
+      operationId: subscription_ListSubscription
       parameters:
         - $ref: '#/components/parameters/search'
         - name: $select
@@ -62,7 +62,7 @@ paths:
       externalDocs:
         description: Find more info here
         url: https://docs.microsoft.com/graph/api/subscription-post-subscriptions?view=graph-rest-1.0
-      operationId: subscriptions.subscription_CreateSubscription
+      operationId: subscription_CreateSubscription
       requestBody:
         description: New entity
         content:
@@ -89,7 +89,7 @@ paths:
       externalDocs:
         description: Find more info here
         url: https://docs.microsoft.com/graph/api/subscription-get?view=graph-rest-1.0
-      operationId: subscriptions.subscription_GetSubscription
+      operationId: subscription_GetSubscription
       parameters:
         - name: subscription-id
           in: path
@@ -144,7 +144,7 @@ paths:
       externalDocs:
         description: Find more info here
         url: https://docs.microsoft.com/graph/api/subscription-update?view=graph-rest-1.0
-      operationId: subscriptions.subscription_UpdateSubscription
+      operationId: subscription_UpdateSubscription
       parameters:
         - name: subscription-id
           in: path
@@ -163,7 +163,7 @@ paths:
         required: true
       responses:
         2XX:
-          description: ''
+          description: Success
           content:
             application/json:
               schema:
@@ -179,7 +179,7 @@ paths:
       externalDocs:
         description: Find more info here
         url: https://docs.microsoft.com/graph/api/subscription-delete?view=graph-rest-1.0
-      operationId: subscriptions.subscription_DeleteSubscription
+      operationId: subscription_DeleteSubscription
       parameters:
         - name: subscription-id
           in: path
@@ -206,7 +206,7 @@ paths:
       tags:
         - subscriptions.Actions
       summary: Invoke action reauthorize
-      operationId: subscriptions_reauthorize
+      operationId: subscription_reauthorize
       parameters:
         - name: subscription-id
           in: path