[AkshayShah03]

Issue #, if available: Fixes #5609

Description of changes:

With the core Session, ModelBuilder.deploy(update_endpoint=True) cannot work. _deploy_core_endpoint calls Session.create_endpoint_config with per-variant kwargs (model_name, initial_instance_count, instance_type, volume_size, ...). Since create_endpoint_config was added to the core Session, the call raises TypeError instead of the AttributeError in the issue: the method takes (name, production_variants, tags, kms_key, data_capture_config_dict, async_inference_config_dict, explainer_config_dict, ...).

This change:

• passes the production_variant that _deploy_core_endpoint already builds a few lines earlier, so instance type and count, volume size, timeouts, serverless config, routing config and AMI version all reach the new config as they do on the create path;
• names the endpoint config with unique_name_from_base(self.model_name). Endpoint config names can't be reused, and the model name stays the same across updates;
• forwards wait to update_endpoint. It previously always waited.

Testing:

• New test_deploy_core_endpoint_update_endpoint_creates_config_from_variants: binds the actual call kwargs against the real Session.create_endpoint_config signature, then checks the production variant, the unique config name, and update_endpoint(..., wait=False). It fails before this change.
• Full sagemaker-serve/tests/unit run: no new failures compared with master. The same 70 tests fail on master and on this branch; they need AWS credentials or depend on test order.

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[github-actions]

🤖 AI code review

This PR fixes ModelBuilder.deploy(update_endpoint=True) on the core Session by passing the already-built production_variant to Session.create_endpoint_config rather than per-variant kwargs that the core signature no longer accepts. I verified against sagemaker-core/src/sagemaker/core/helper/session_helper.py: the new kwargs (name, production_variants, tags, kms_key, data_capture_config_dict, async_inference_config_dict, explainer_config_dict) match create_endpoint_config's signature, update_endpoint accepts wait, and serverless/routing/AMI settings now reach the config via the production variant. The change is correct, matches the create path's behavior, and is covered by a targeted unit test. No issues found.

_{Reviewed commit 74e2599. Automated review; verify before acting.}