Fix BedrockTitanEmbeddingModelIT

- Create ObservationRegistry bean for the tests

Signed-off-by: Ilayaperumal Gopinathan <ilayaperumal.gopinathan@broadcom.com>

models/spring-ai-bedrock/src/test/java/org/springframework/ai/bedrock/titan/BedrockTitanEmbeddingModelIT.java

@@ -79,6 +79,11 @@ class BedrockTitanEmbeddingModelIT {
 	@SpringBootConfiguration
 	public static class TestConfiguration {
 
+		@Bean
+		public TestObservationRegistry observationRegistry() {
+			return TestObservationRegistry.create();
+		}
+
 		@Bean
 		public TitanEmbeddingBedrockApi titanEmbeddingApi() {
 			return new TitanEmbeddingBedrockApi(TitanEmbeddingModel.TITAN_EMBED_IMAGE_V1.id(),