feat(extensibility): clean up ORD integration

[sophiaabi]

Disclaimer: Do not include SAP-internal or customer-specific information in this PR (e.g. internal system URLs, customer names, tenant IDs, or confidential configurations). This is a public repository.

Description

Remove the feature to add dynamic extended integration dependencies to agent ORD as it is no longer a requirement for extensibility to work for net new MCP servers

Type of Change

Please check the relevant option:

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• Dependency update

Checklist

Before submitting your PR, please review and check the following:

• I have read the Contributing Guidelines
• I have verified that my changes solve the issue
• I have added/updated automated tests to cover my changes
• All tests pass locally
• I have verified that my code follows the Code Guidelines
• I have updated documentation (if applicable)
• I have added type hints for all public APIs
• My code does not contain sensitive information (credentials, tokens, etc.)
• I have followed Conventional Commits for commit messages

Breaking Changes

If this PR introduces breaking changes, please describe:

Any consumer using:
from sap_cloud_sdk.extensibility import add_extension_integration_dependencies
will get an ImportError after upgrading.

Users should remove the usage of this method from their ORD implementation as it is no longer necessary for extensibility.

[cla-assistant]

All committers have signed the CLA.