Fix duplicate TaskInstanceState entity in FastApi Schema (apache#43824

)

It was the cause of apache#43823 (comment)

```
airflow__api_fastapi__core_api__datamodels__ui__dashboard__TaskInstanceState
TaskInstanceState
```

airflow/api_fastapi/core_api/datamodels/ui/dashboard.py

@@ -37,7 +37,7 @@ class DAGRunStates(BaseModel):
     failed: int
 
 
-class TaskInstanceState(BaseModel):
+class TaskInstanceStateCount(BaseModel):
     """TaskInstance serializer for responses."""
 
     no_status: int
@@ -60,4 +60,4 @@ class HistoricalMetricDataResponse(BaseModel):
 
     dag_run_types: DAGRunTypes
     dag_run_states: DAGRunStates
-    task_instance_states: TaskInstanceState
+    task_instance_states: TaskInstanceStateCount

airflow/api_fastapi/core_api/openapi/v1-generated.yaml

@@ -4336,7 +4336,7 @@ components:
         dag_run_states:
           $ref: '#/components/schemas/DAGRunStates'
         task_instance_states:
-          $ref: '#/components/schemas/airflow__api_fastapi__core_api__datamodels__ui__dashboard__TaskInstanceState'
+          $ref: '#/components/schemas/TaskInstanceStateCount'
       type: object
       required:
       - dag_run_types
@@ -4798,7 +4798,7 @@ components:
           title: Duration
         state:
           anyOf:
-          - $ref: '#/components/schemas/airflow__utils__state__TaskInstanceState'
+          - $ref: '#/components/schemas/TaskInstanceState'
           - type: 'null'
         try_number:
           type: integer
@@ -4913,6 +4913,84 @@ components:
       - triggerer_job
       title: TaskInstanceResponse
       description: TaskInstance serializer for responses.
+    TaskInstanceState:
+      type: string
+      enum:
+      - removed
+      - scheduled
+      - queued
+      - running
+      - success
+      - restarting
+      - failed
+      - up_for_retry
+      - up_for_reschedule
+      - upstream_failed
+      - skipped
+      - deferred
+      title: TaskInstanceState
+      description: 'All possible states that a Task Instance can be in.
+
+
+        Note that None is also allowed, so always use this in a type hint with Optional.'
+    TaskInstanceStateCount:
+      properties:
+        no_status:
+          type: integer
+          title: No Status
+        removed:
+          type: integer
+          title: Removed
+        scheduled:
+          type: integer
+          title: Scheduled
+        queued:
+          type: integer
+          title: Queued
+        running:
+          type: integer
+          title: Running
+        success:
+          type: integer
+          title: Success
+        restarting:
+          type: integer
+          title: Restarting
+        failed:
+          type: integer
+          title: Failed
+        up_for_retry:
+          type: integer
+          title: Up For Retry
+        up_for_reschedule:
+          type: integer
+          title: Up For Reschedule
+        upstream_failed:
+          type: integer
+          title: Upstream Failed
+        skipped:
+          type: integer
+          title: Skipped
+        deferred:
+          type: integer
+          title: Deferred
+      type: object
+      required:
+      - no_status
+      - removed
+      - scheduled
+      - queued
+      - running
+      - success
+      - restarting
+      - failed
+      - up_for_retry
+      - up_for_reschedule
+      - upstream_failed
+      - skipped
+      - deferred
+      title: TaskInstanceStateCount
+      description: TaskInstance serializer for responses.
     TriggerResponse:
       properties:
         id:
@@ -5056,81 +5134,3 @@ components:
       - git_version
       title: VersionInfo
       description: Version information serializer for responses.
-    airflow__api_fastapi__core_api__datamodels__ui__dashboard__TaskInstanceState:
-      properties:
-        no_status:
-          type: integer
-          title: No Status
-        removed:
-          type: integer
-          title: Removed
-        scheduled:
-          type: integer
-          title: Scheduled
-        queued:
-          type: integer
-          title: Queued
-        running:
-          type: integer
-          title: Running
-        success:
-          type: integer
-          title: Success
-        restarting:
-          type: integer
-          title: Restarting
-        failed:
-          type: integer
-          title: Failed
-        up_for_retry:
-          type: integer
-          title: Up For Retry
-        up_for_reschedule:
-          type: integer
-          title: Up For Reschedule
-        upstream_failed:
-          type: integer
-          title: Upstream Failed
-        skipped:
-          type: integer
-          title: Skipped
-        deferred:
-          type: integer
-          title: Deferred
-      type: object
-      required:
-      - no_status
-      - removed
-      - scheduled
-      - queued
-      - running
-      - success
-      - restarting
-      - failed
-      - up_for_retry
-      - up_for_reschedule
-      - upstream_failed
-      - skipped
-      - deferred
-      title: TaskInstanceState
-      description: TaskInstance serializer for responses.
-    airflow__utils__state__TaskInstanceState:
-      type: string
-      enum:
-      - removed
-      - scheduled
-      - queued
-      - running
-      - success
-      - restarting
-      - failed
-      - up_for_retry
-      - up_for_reschedule
-      - upstream_failed
-      - skipped
-      - deferred
-      title: TaskInstanceState
-      description: 'All possible states that a Task Instance can be in.
-
-
-        Note that None is also allowed, so always use this in a type hint with Optional.'