[CI/Build] Re-enable registry tests for 3 now-public model checkpoints

Granite4VisionForConditionalGeneration, GlmOcrMTPModel and
Qwen3DSparkModel carry is_available_online=False, set while their
checkpoints were unpublished. All three repos are now public on the
Hub, their configs declare the registered architectures, and
test_can_initialize_large_subset passes for all three locally, so the
flags only disable coverage.

An audit of the remaining flagged entries found the rest must stay
flagged — not for availability, but because initialization genuinely
fails: DeepSeek-V4 asserts fp8_ds_mla requires an fp8 kv-cache (the
test uses auto), MiniMax-M3 OOMs a 32 GiB GPU even with dummy weights,
and Gemma4-Unified/Intern-S2 hit config errors ('sliding_attention' is
not in list). Those need their own fixes before unflagging.

Same defect class as the Cosmos3 fix in #48211.

Assisted-by: Claude
Signed-off-by: Mingfei Guo <1800012773@pku.edu.cn>

Author: guoriyue

tests/models/registry.py

@@ -895,7 +895,6 @@ def check_available_online(
     ),
     "Granite4VisionForConditionalGeneration": _HfExamplesInfo(
         "ibm-granite/granite-vision-4.1-4b",
-        is_available_online=False,
     ),
     "GraniteVision": _HfExamplesInfo("ibm-granite/granite-vision-3.3-2b"),
     "GraniteSpeechForConditionalGeneration": _HfExamplesInfo(
@@ -1442,7 +1441,6 @@ def check_available_online(
     "Qwen3DSparkModel": _HfExamplesInfo(
         "Qwen/Qwen3-8B",
         speculative_model="deepseek-ai/dspark_qwen3_8b_block7",
-        is_available_online=False,
         use_original_num_layers=True,  # DSpark backbone requires all layers
     ),
     # [Eagle]
@@ -1617,7 +1615,6 @@ def check_available_online(
     "GlmOcrMTPModel": _HfExamplesInfo(
         "zai-org/GLM-OCR",
         speculative_model="zai-org/GLM-OCR",
-        is_available_online=False,
         min_transformers_version="5.1.0",
     ),
     "HYV3MTPModel": _HfExamplesInfo(