[AkshayShah03]

Issue #, if available: N/A

Description of changes:

_build_for_djl sets HF_HUB_OFFLINE=1 for local modes. After creating the model, it resets the flag, but on the wrong key:

if "HF_HUB_OFFLINE" in self.env_vars:
    self.env_vars.update({"TRANSFORMERS_OFFLINE": "0"})

This looks like a leftover from the flag rename; the TGI, HF and TEI builders all reset HF_HUB_OFFLINE itself. Since env_vars persists on the ModelBuilder, a build() for LOCAL_CONTAINER followed by a build() for SAGEMAKER_ENDPOINT deployed the endpoint with HF_HUB_OFFLINE=1, plus a stray TRANSFORMERS_OFFLINE=0. The DJL container then can't download HF_MODEL_ID from the Hub.

This change resets HF_HUB_OFFLINE, as the other builders do. Local mode is unaffected: the model, and therefore the local container, is created before the reset, and the container definition copies env_vars.

Testing:

• New test_local_build_does_not_leave_hf_hub_offline_for_endpoint_build builds for local and then for the endpoint, capturing the env at each _create_model call. It fails before this change.
• test_local_mode_sets_hf_hub_offline asserted the leftover in-memory state. It now checks the env the model is created with, which is still HF_HUB_OFFLINE=1.
• Server builder tests: no new failures. The same 15 tests fail on master.

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