feat(servicecatalog): graduate to stable 🚀 (#19515)

We will move library to stable, and promise semantic versioning for APIs.

We have no expected breaking changes at this time, and no reported bugs.

**Feel free to report or question any current APIs**

----

### All Submissions:

* [X] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: arcrank

packages/@aws-cdk/aws-servicecatalog/README.md

@@ -5,17 +5,7 @@
 
 ![cfn-resources: Stable](https://img.shields.io/badge/cfn--resources-stable-success.svg?style=for-the-badge)
 
-> All classes with the `Cfn` prefix in this module ([CFN Resources]) are always stable and safe to use.
->
-> [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib
-
-![cdk-constructs: Developer Preview](https://img.shields.io/badge/cdk--constructs-developer--preview-informational.svg?style=for-the-badge)
-
-> The APIs of higher level constructs in this module are in **developer preview** before they
-> become stable. We will only make breaking changes to address unforeseen API issues. Therefore,
-> these APIs are not subject to [Semantic Versioning](https://semver.org/), and breaking changes
-> will be announced in release notes. This means that while you may use them, you may need to
-> update your source code when upgrading to a newer version of this package.
+![cdk-constructs: Stable](https://img.shields.io/badge/cdk--constructs-stable-success.svg?style=for-the-badge)
 
 ---
 
@@ -203,6 +193,7 @@ You can add a product to multiple portfolios depending on your organizational st
 ```ts
 declare const portfolio: servicecatalog.Portfolio;
 declare const product: servicecatalog.CloudFormationProduct;
+
 portfolio.addProduct(product);
 ```
 

packages/@aws-cdk/aws-servicecatalog/package.json

@@ -121,8 +121,8 @@
       "ref-via-interface:@aws-cdk/aws-servicecatalog.PortfolioProps.tagOptions"
     ]
   },
-  "maturity": "developer-preview",
-  "stability": "experimental",
+  "maturity": "stable",
+  "stability": "stable",
   "awscdkio": {
     "announce": false
   },