fix(appconfig): deprecate deploy method (#29021)

### Reason for this change

Want to recommend against creating AppConfig resources across multiple stacks.

### Description of changes



### Description of how you validated changes



### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)


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

packages/@aws-cdk/aws-appconfig-alpha/lib/configuration.ts

@@ -307,6 +307,9 @@ abstract class ConfigurationBase extends Construct implements IConfiguration, IE
    * Deploys the configuration to the specified environment.
    *
    * @param environment The environment to deploy the configuration to
+   * @deprecated Use `deployTo` as a property instead. We do not recommend
+   * creating resources in multiple stacks. If you want to do this still,
+   * please take a look into https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_appconfig.CfnDeployment.html.
    */
   public deploy(environment: IEnvironment) {
     const logicalId = `Deployment${this.getDeploymentHash(environment)}`;