Add account ID to resolved SSO session credentials (#5592)

Author: davidh44

services/sso/src/main/java/software/amazon/awssdk/services/sso/auth/SsoCredentialsProvider.java

@@ -111,6 +111,7 @@ private SessionCredentialsHolder getUpdatedCredentials(SsoClient ssoClient) {
                                                                         .accessKeyId(roleCredentials.accessKeyId())
                                                                         .secretAccessKey(roleCredentials.secretAccessKey())
                                                                         .sessionToken(roleCredentials.sessionToken())
+                                                                        .accountId(request.accountId())
                                                                         .providerName(PROVIDER_NAME)
                                                                         .build();
         return new SessionCredentialsHolder(sessionCredentials, Instant.ofEpochMilli(roleCredentials.expiration()));

services/sso/src/test/java/software/amazon/awssdk/services/sso/auth/SsoCredentialsProviderTest.java

@@ -90,7 +90,10 @@ public void distantExpiringCredentialsUpdatedInBackground_OverridePrefetchAndSta
 
 
     private GetRoleCredentialsRequestSupplier getRequestSupplier() {
-        return new GetRoleCredentialsRequestSupplier(GetRoleCredentialsRequest.builder().build(), "cachedToken");
+        return new GetRoleCredentialsRequestSupplier(GetRoleCredentialsRequest.builder()
+                                                                              .accountId("123456789")
+                                                                              .build(),
+                                                     "cachedToken");
     }
 
     private GetRoleCredentialsResponse getResponse(RoleCredentials roleCredentials) {
@@ -134,6 +137,7 @@ private void callClientWithCredentialsProvider(Instant credentialsExpirationDate
                 assertThat(actualCredentials.secretAccessKey()).isEqualTo("b");
                 assertThat(actualCredentials.sessionToken()).isEqualTo("c");
                 assertThat(actualCredentials.providerName()).isPresent().contains("SsoCredentialsProvider");
+                assertThat(actualCredentials.accountId()).isPresent().contains("123456789");
             }
         }