Add deprecated key word to the agent based snowflake integration tile (#17931)

* add deprecated key word to the agent based snowflake integration

* update the overview

Author: HadhemiDD

snowflake/README.md

@@ -5,8 +5,11 @@
 This check monitors [Snowflake][1] through the Datadog Agent. Snowflake is a SaaS-analytic data warehouse and runs completely on cloud infrastructure. 
 This integration monitors credit usage, billing, storage, query metrics, and more.
 
+Note: This integration is now deprecated and replaced by the new API-based integration. We recommend you fully uninstall the agent integration before installing the new API-based integration. All metrics from the previous integration are available in the new integration, along with new offerings of logs and cloud cost metrics.
+
 <div class="alert alert-info"><bold>Note</bold>: Metrics are collected with queries to Snowflake. Queries made by the Datadog integration are billable by Snowflake.</div>
 
+
 ## Setup
 
 Follow the instructions below to install and configure this check for an Agent running on a host.

snowflake/manifest.json

@@ -9,7 +9,7 @@
     "support": "README.md#Support",
     "changelog": "CHANGELOG.md",
     "description": "Monitor key metrics for credit usage, storage, query, user history and more.",
-    "title": "Snowflake - Agent based",
+    "title": "Snowflake - Agent based (Deprecated)",
     "media": [],
     "classifier_tags": [
       "Supported OS::Linux",