[5.11.x] Update registry reference

[Miranlfk]

Purpose

This pull request updates references to the WSO2 Docker image registry to ensure consistency with the latest registry naming conventions. The changes affect both documentation and Dockerfiles.

Registry reference updates:

• Updated the base image in docker-compose/is/dockerfiles/is/Dockerfile to use registry.wso2.com/wso2-is/is:5.11.0.0 instead of the deprecated docker.wso2.com/wso2is:5.11.0.0.
• Updated instructions in docker-compose/is/README.md to remove the registry.wso2.com/ prefix (previously docker.wso2.com/) from the image name when using locally built images, reflecting the new registry naming.

Related Issues

• https://github.com/wso2-enterprise/iam-engineering/issues/1164

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