Add Bedrock Model Support

[alexheifetz]

This pull request updates the Maven configuration in examples-java/pom.xml to improve support for model selection via environment variables. The most significant changes are the addition of a new profile for Bedrock models and the renaming of an environment variable for Docker models.

Model profile enhancements:

• Added a new Maven profile bedrock-models that activates when env.ENABLE_BEDROCK is set, including the embabel-agent-starter-bedrock dependency.
• Renamed the activation property for the docker-models profile from env.DOCKER_MODELS_AVAILABLE to env.ENABLE_DOCKER_MODELS for consistency and clarity.

General dependency section cleanup:

• Minor formatting adjustment in the dependencies section to remove an unnecessary blank line.