Add changelog entry and fix test feedback

Author: psantus

.changelog/44965.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_sagemaker_domain: Add trusted_identity_propagation_enabled argument to domain_settings
+```

internal/service/sagemaker/domain.go

@@ -3059,10 +3059,10 @@ func flattenDomainSettings(config *awstypes.DomainSettings) []map[string]any {
 	}
 
 	m := map[string]any{
-		"docker_settings":                     flattenDockerSettings(config.DockerSettings),
-		"execution_role_identity_config":      config.ExecutionRoleIdentityConfig,
-		"r_studio_server_pro_domain_settings": flattenRStudioServerProDomainSettings(config.RStudioServerProDomainSettings),
-		names.AttrSecurityGroupIDs:            flex.FlattenStringValueSet(config.SecurityGroupIds),
+		"docker_settings":                      flattenDockerSettings(config.DockerSettings),
+		"execution_role_identity_config":       config.ExecutionRoleIdentityConfig,
+		"r_studio_server_pro_domain_settings":  flattenRStudioServerProDomainSettings(config.RStudioServerProDomainSettings),
+		names.AttrSecurityGroupIDs:             flex.FlattenStringValueSet(config.SecurityGroupIds),
 		"trusted_identity_propagation_enabled": config.TrustedIdentityPropagationSettings != nil && config.TrustedIdentityPropagationSettings.Status == awstypes.FeatureStatusEnabled,
 	}
 

internal/service/sagemaker/domain_test.go

@@ -1817,7 +1817,7 @@ func testAccDomain_trustedIdentityPropagation(t *testing.T) {
 					testAccCheckDomainExists(ctx, resourceName, &domain),
 					resource.TestCheckResourceAttr(resourceName, names.AttrDomainName, rName),
 					resource.TestCheckResourceAttr(resourceName, "auth_mode", "SSO"),
-					resource.TestCheckResourceAttr(resourceName, "domain_settings.0.trusted_identity_propagation_enabled", "true"),
+					resource.TestCheckResourceAttr(resourceName, "domain_settings.0.trusted_identity_propagation_enabled", acctest.CtTrue),
 				),
 			},
 			{