[AutoPR azure-resourcemanager-containerservicefleet] Release the Fleet 2025-04-01-preview API

Create to sync https://github.com/Azure/azure-rest-api-specs/pull/34655 ```sh curl -L "Azure/34655/azure-sdk-for-java/azure-resourcemanager-containerservicefleet/azure-resourcemanager-containerservicefleet-1.2.0.jar" -o azure-resourcemanager-containerservicefleet-1.2.0.jar mvn install:install-file -DgroupId=com.azure.resourcemanager -DartifactId=azure-resourcemanager-containerservicefleet -Dversion=1.0.0-beta.0 -Dfile=azure-resourcemanager-containerservicefleet-1.2.0.jar -Dpackaging=jar -DgeneratePom=true ``` This pull request has been automatically generated for preview purposes.