chore(iot): IoT deprecation (#10509)

* chore(iot): create README.md for IoT deprecation

* chore(iot): remove IoT samples after deprecation

* chore(iot): remove IoT entries in blunderbuss.yml

Author: meredithslota

.github/blunderbuss.yml

@@ -145,11 +145,6 @@ assign_issues_by:
       - "api: healthcare"
     to:
       - GoogleCloudPlatform/healthcare-life-sciences
-  - labels:
-      - "api: iot"
-      - "api: cloudiot"
-    to:
-      - GoogleCloudPlatform/api-iot
   - labels:
       - "api: retail"
     to:
@@ -304,11 +299,6 @@ assign_prs_by:
       - "api: healthcare"
     to:
       - GoogleCloudPlatform/healthcare-life-sciences
-  - labels:
-      - "api: iot"
-      - "api: cloudiot"
-    to:
-      - GoogleCloudPlatform/api-iot
   - labels:
       - "api: retail"
     to:

iot/README.md

@@ -0,0 +1 @@
+Cloud IoT Core was retired on August 16, 2023. After August 15, 2023, the documentation for IoT Core is no longer be available. See https://cloud.google.com/iot-core for a host of partner-led solutions, built on Google Cloud, that meet the needs of IoT customers.