feat(java): activate flag eval metrics system tests

Enable tests/ffe/test_flag_eval_metrics.py for the Java SDK.
10 of 17 tests pass. 7 tests annotated as bug (FFL-1972) for
known DDEvaluator gaps:
- 2x reason mapping (targeting_match instead of static/split)
- 2x type mismatch (silent coercion instead of error)
- 2x parse error (invalid regex, variant type mismatch)
- 1x metric count (OTLP delta temporality points format)

Also adds opentelemetry-sdk-metrics and opentelemetry-exporter-otlp
to the Java Spring Boot weblog pom.xml, required for the
dd-openfeature provider's eval metrics OTel counter.

Author: typotter

manifests/java.yml

@@ -3067,7 +3067,14 @@ manifest:
         "*": irrelevant
         spring-boot: v1.56.0
   tests/ffe/test_exposures.py::Test_FFE_EXP_5_Missing_Targeting_Key: bug (FFL-1729)
-  tests/ffe/test_flag_eval_metrics.py: missing_feature
+  tests/ffe/test_flag_eval_metrics.py: v1.60.0
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Metric_Count::test_ffe_eval_metric_count: bug (FFL-1972)
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Metric_Basic::test_ffe_eval_metric_basic: bug (FFL-1972)
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Reason_Split::test_ffe_eval_reason_split: bug (FFL-1972)
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Metric_Type_Mismatch::test_ffe_eval_metric_type_mismatch: bug (FFL-1972)
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Metric_Numeric_To_Integer::test_ffe_eval_metric_numeric_to_integer: bug (FFL-1972)
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Metric_Parse_Error_Invalid_Regex::test_ffe_eval_metric_parse_error_invalid_regex: bug (FFL-1972)
+  tests/ffe/test_flag_eval_metrics.py::Test_FFE_Eval_Metric_Parse_Error_Variant_Type_Mismatch::test_ffe_eval_metric_parse_error_variant_type_mismatch: bug (FFL-1972)
   tests/integration_frameworks/llm/anthropic/test_anthropic_llmobs.py::TestAnthropicLlmObsMessages::test_create_error: bug (MLOB-1234)
   tests/integration_frameworks/llm/openai/test_openai_apm.py: v1.61.0
   tests/integration_frameworks/llm/openai/test_openai_llmobs.py: v1.61.0

utils/build/docker/java/spring-boot/pom.xml

@@ -60,6 +60,16 @@
             <artifactId>opentelemetry-api</artifactId>
             <version>1.41.0</version>
         </dependency>
+        <dependency>
+            <groupId>io.opentelemetry</groupId>
+            <artifactId>opentelemetry-sdk-metrics</artifactId>
+            <version>1.41.0</version>
+        </dependency>
+        <dependency>
+            <groupId>io.opentelemetry</groupId>
+            <artifactId>opentelemetry-exporter-otlp</artifactId>
+            <version>1.41.0</version>
+        </dependency>
         <dependency>
             <groupId>io.opentracing</groupId>
             <artifactId>opentracing-api</artifactId>