snowflake model retirement tags update (#4937)

* Update spec.yaml

* Add inference dates to snowflake-artic-instruct spec

Author: VindyaKonjarla

assets/models/system/snowflake-arctic-base/spec.yaml

@@ -15,6 +15,9 @@ tags:
   task: text-generation
   SharedComputeCapacityEnabled: ''
   author: Snowflake
+  InferenceLegacyDate: '2026-03-16'
+  InferenceDeprecationDate: '2026-04-16'
+  InferenceRetirementDate: '2026-07-31'
   inference_compute_allow_list:
    [ 
     Standard_ND96isr_H100_v5

assets/models/system/snowflake-artic-instruct/spec.yaml

@@ -12,6 +12,9 @@ tags:
   task: chat-completion
   SharedComputeCapacityEnabled: ""
   author: Snowflake
+  InferenceLegacyDate: '2026-03-16'
+  InferenceDeprecationDate: '2026-04-16'
+  InferenceRetirementDate: '2026-07-31'
   hiddenlayerscanned: ""
   inference_compute_allow_list: 
     [