Callouts for upcoming Microsoft adapter support (#4259)

## What are you changing in this pull request and why?

Add callouts about dbt Cloud support for MS Fabric and Synapse coming
soon to these 3 pages:
- https://docs.getdbt.com/docs/supported-data-platforms
- https://docs.getdbt.com/docs/verified-adapters
-
https://docs.getdbt.com/docs/cloud/connect-data-platform/about-connections

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [x] Need review from PMM

Adding new pages (delete if not applicable):
- [x] ~~Add page to `website/sidebars.js`~~ new file is a partial
- [x] Provide a unique filename for the new page

website/docs/docs/cloud/connect-data-platform/about-connections.md

@@ -13,6 +13,10 @@ dbt Cloud can connect with a variety of data platform providers including:
 - [Snowflake](/docs/cloud/connect-data-platform/connect-snowflake)
 - [Starburst or Trino](/docs/cloud/connect-data-platform/connect-starburst-trino)
 
+import MSCallout from '/snippets/_microsoft-adapters-soon.md';
+
+<MSCallout />
+
 You can connect to your database in dbt Cloud by clicking the gear in the top right and selecting **Account Settings**. From the Account Settings page, click **+ New Project**.
 
 <Lightbox src="/img/docs/dbt-cloud/cloud-configuring-dbt-cloud/choose-a-connection.png" title="Choose a connection"/>

website/docs/docs/supported-data-platforms.md

@@ -12,6 +12,10 @@ You can [connect](/docs/connect-adapters) to adapters and data platforms either
 
 You can also further customize how dbt works with your specific data platform via configuration: see [Configuring Postgres](/reference/resource-configs/postgres-configs) for an example.
 
+import MSCallout from '/snippets/_microsoft-adapters-soon.md';
+
+<MSCallout />
+
 ## Types of Adapters
 
 There are three types of adapters available today:

website/docs/docs/verified-adapters.md

@@ -13,6 +13,10 @@ The verification process serves as the on-ramp to integration with dbt Cloud. As
 
 To learn more, see [Verifying a new adapter](/guides/dbt-ecosystem/adapter-development/7-verifying-a-new-adapter).
 
+import MSCallout from '/snippets/_microsoft-adapters-soon.md';
+
+<MSCallout />
+
 Here are the verified data platforms that connect to dbt and its latest version.
 
 import AdaptersVerified from '/snippets/_adapters-verified.md';

website/snippets/_microsoft-adapters-soon.md

@@ -0,0 +1,3 @@
+:::tip Coming soon
+dbt Cloud support for the Microsoft Fabric and Azure Synapse Analytics adapters is coming soon! 
+:::