fix(jumpstart): add eusc-de-east-1 buckets and name JumpStart in the bucket error

`JumpStartModel` for `deepseek-llm-r1-distill-llama-8b` in `eusc-de-east-1` failed with `ValueError: Unable to get content bucket for Neo in eusc-de-east-1 region.` The region configuration had no `eusc-de-east-1` entry, and the JumpStart bucket accessor named Neo in its error. The model does not use Neo.

Add the public and gated JumpStart buckets for `eusc-de-east-1`. Name JumpStart in the error.

---
X-AI-Prompt: What is the minimal source change that fixes the EU Sovereign Cloud JumpStart error?
X-AI-Tool: claude-code

Author: evakravi

src/sagemaker/jumpstart/region_config.json

@@ -119,6 +119,10 @@
         "gated_content_bucket": "jumpstart-private-cache-prod-eu-west-3",
         "neo_content_bucket": "sagemaker-sd-models-prod-eu-west-3"
     },
+    "eusc-de-east-1": {
+        "content_bucket": "jumpstart-cache-prod-eusc-de-east-1",
+        "gated_content_bucket": "jumpstart-private-cache-prod-eusc-de-east-1"
+    },
     "il-central-1": {
         "content_bucket": "jumpstart-cache-prod-il-central-1",
         "gated_content_bucket": "jumpstart-private-cache-prod-il-central-1"

src/sagemaker/jumpstart/utils.py

@@ -165,7 +165,7 @@ def get_jumpstart_content_bucket(
         except KeyError:
             formatted_launched_regions_str = get_jumpstart_launched_regions_message()
             raise ValueError(
-                f"Unable to get content bucket for Neo in {region} region. "
+                f"Unable to get content bucket for JumpStart in {region} region. "
                 f"{formatted_launched_regions_str}"
             )
 

tests/unit/sagemaker/jumpstart/test_utils.py

@@ -74,9 +74,18 @@ class TestBucketUtils(TestCase):
     def test_get_jumpstart_content_bucket(self):
         bad_region = "bad_region"
         assert bad_region not in JUMPSTART_REGION_NAME_SET
-        with pytest.raises(ValueError):
+        with pytest.raises(
+            ValueError,
+            match=r"^Unable to get content bucket for JumpStart in bad_region region\.",
+        ):
             utils.get_jumpstart_content_bucket(bad_region)
 
+    def test_get_jumpstart_content_bucket_eusc(self):
+        assert (
+            utils.get_jumpstart_content_bucket("eusc-de-east-1")
+            == "jumpstart-cache-prod-eusc-de-east-1"
+        )
+
     def test_get_jumpstart_content_bucket_no_args(self):
         assert (
             utils.get_jumpstart_content_bucket(JUMPSTART_DEFAULT_REGION_NAME)
@@ -96,6 +105,12 @@ def test_get_jumpstart_gated_content_bucket(self):
         with pytest.raises(ValueError):
             utils.get_jumpstart_gated_content_bucket(bad_region)
 
+    def test_get_jumpstart_gated_content_bucket_eusc(self):
+        assert (
+            utils.get_jumpstart_gated_content_bucket("eusc-de-east-1")
+            == "jumpstart-private-cache-prod-eusc-de-east-1"
+        )
+
     def test_get_jumpstart_gated_content_bucket_no_args(self):
         assert (
             utils.get_jumpstart_gated_content_bucket(JUMPSTART_DEFAULT_REGION_NAME)