fix: Settings objects should not try to read quotaProjectId from credentials (#1162)

* fix: defer credential loading until you ask for quotaProjectId

* fix: StubSettings doesn't need to know quotaProjectId loading order

* test: remove test scenario we don't care about

Author: chingor13

gax/src/main/java/com/google/api/gax/rpc/StubSettings.java

@@ -41,7 +41,6 @@
 import com.google.api.gax.core.NoCredentialsProvider;
 import com.google.api.gax.tracing.ApiTracerFactory;
 import com.google.api.gax.tracing.NoopApiTracerFactory;
-import com.google.auth.Credentials;
 import com.google.auth.oauth2.QuotaProjectIdProvider;
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
@@ -266,14 +265,6 @@ public B setExecutorProvider(ExecutorProvider executorProvider) {
     /** Sets the CredentialsProvider to use for getting the credentials to make calls with. */
     public B setCredentialsProvider(CredentialsProvider credentialsProvider) {
       this.credentialsProvider = Preconditions.checkNotNull(credentialsProvider);
-      try {
-        Credentials credentials = credentialsProvider.getCredentials();
-        if (this.quotaProjectId == null && credentials instanceof QuotaProjectIdProvider) {
-          this.quotaProjectId = ((QuotaProjectIdProvider) credentials).getQuotaProjectId();
-        }
-      } catch (IOException e) {
-        System.out.println("fail to fetch credentials");
-      }
       return self();
     }
 

gax/src/test/java/com/google/api/gax/rpc/ClientSettingsTest.java

@@ -420,8 +420,6 @@ public Credentials getCredentials() throws IOException {
         .isEqualTo(QUOTA_PROJECT_ID_FROM_INTERNAL_HEADER_VALUE);
     Truth.assertThat(builder_setQuotaFromInternalHeadersAndBuilders.getQuotaProjectId())
         .isEqualTo(QUOTA_PROJECT_ID_FROM_BUILDERS);
-    Truth.assertThat(builder_setQuotaFromCredentialsProvider.getQuotaProjectId())
-        .isEqualTo(QUOTA_PROJECT_ID_FROM_CREDENTIALS_VALUE);
     Truth.assertThat(builder_setQuotaFromCredentialsProviderAndBuilder.getQuotaProjectId())
         .isEqualTo(QUOTA_PROJECT_ID_FROM_BUILDERS);
     Truth.assertThat(builder_setQuotaFromAllSources.getQuotaProjectId())