remove llava from test-models-linux (#8702)

See comment for explanation -- already have test-llava-runner-linux

Author: swolchok

.ci/scripts/gather_test_models.py

@@ -104,8 +104,12 @@ def model_should_run_on_target_os(model: str, target_os: str) -> bool:
     For example, a big model can be disabled in macos due to the limited macos resources.
     """
     if target_os == "macos":
+        # Disabled in macos due to limited resources, and should stay that way even if
+        # we otherwise re-enable.
         return model not in ["llava"]
-    return True
+    # Disabled globally because we have test-llava-runner-linux that does a more
+    # comprehensive E2E test of llava.
+    return model not in ["llava"]
 
 
 def export_models_for_ci() -> dict[str, dict]: