chore: activate easy wins for @DataDog/feature-flagging-and-experimentation-sdk

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: dd-octo-sts[bot]

manifests/php.yml

@@ -747,7 +747,14 @@ manifest:
   tests/parametric/test_dynamic_configuration.py::TestDynamicConfigV2: '>=1.16.0'
   tests/parametric/test_dynamic_configuration.py::TestDynamicConfigV2::test_tracing_client_tracing_tags: missing_feature
   tests/parametric/test_ffe/test_dynamic_evaluation.py::Test_Feature_Flag_Dynamic_Evaluation: v1.21.0-dev
-  tests/parametric/test_ffe/test_span_enrichment.py: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py: '>=1.21.0'  # TODO: a lower version might be supported
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Child_Span_Propagation: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Default_Fallback: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Max_Experiments_Per_Subject: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Max_Serial_IDs: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Max_Subjects: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Serial_IDs: missing_feature
+  tests/parametric/test_ffe/test_span_enrichment.py::Test_Span_Enrichment_Subjects: missing_feature
   tests/parametric/test_headers_b3.py::Test_Headers_B3::test_headers_b3_migrated_extract_invalid:
     - declaration: missing_feature (Need to remove b3=b3multi alias)
       component_version: <1.16.0