Activate OpenAi and Anthropic only if Keys are present.

[alexheifetz]

This pull request updates the pom.xml configuration to improve how dependencies for OpenAI and Anthropic model support are managed. Instead of always including these dependencies, they are now conditionally added via Maven profiles that activate only when the corresponding API key environment variable is present. This makes the build more flexible and secure by only including necessary dependencies when required.

Dependency management improvements:

• Removed the unconditional inclusion of embabel-agent-starter-openai and commented-out Anthropic dependencies from the main dependency list.
• Added two Maven profiles, openai-models and anthropic-models, which automatically add the respective dependencies only if OPENAI_API_KEY or ANTHROPIC_API_KEY environment variables are set.Environment

[alexheifetz]

Will merge it, we can take alternate solution after the java-template tests are fixed.