pubsub: always send bigqueryConfig in the updateMask when configured

[modular-magician]

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pubsub: always send `bigqueryConfig` in the updateMask when configured

Closes hashicorp/terraform-provider-google#24891

---

Reproduced issue in GoogleCloudPlatform/magic-modules@23b53cc with:

➜ make testacc TEST=./google/services/pubsub TESTARGS='-run=TestAccPubsubSubscription_bigquery_config_update'
sh -c "'/Users/ramon/go/src/github.com/hashicorp/terraform-provider-google/scripts/gofmtcheck.sh'"
==> Checking that code complies with gofmt requirements...
go vet
TF_ACC_REFRESH_AFTER_APPLY=1 TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google/services/pubsub -v -run=TestAccPubsubSubscription_bigquery_config_update -timeout 240m -ldflags="-X=github.com/hashicorp/terraform-provider-google/version.ProviderVersion=acc"
=== RUN   TestAccPubsubSubscription_bigquery_config_update
=== PAUSE TestAccPubsubSubscription_bigquery_config_update
=== CONT  TestAccPubsubSubscription_bigquery_config_update
    resource_pubsub_subscription_test.go:673: Step 3/4 error: Error running apply: exit status 1

        Error: Error updating Subscription "projects/magic-modules-dev/subscriptions/tf-test-sub-vv7fn3hktk": googleapi: Error 403: The caller does not have permission

          with google_pubsub_subscription.foo,
          on terraform_plugin_test.tf line 12, in resource "google_pubsub_subscription" "foo":
          12: resource "google_pubsub_subscription" "foo" {

--- FAIL: TestAccPubsubSubscription_bigquery_config_update (104.87s)
FAIL
FAIL    github.com/hashicorp/terraform-provider-google/google/services/pubsub   105.678s
FAIL
make: *** [testacc] Error 1

Resolved issue by always sending the bigqueryConfig in the updateMask just like the google cli does in GoogleCloudPlatform/magic-modules@12b4c37:

➜ make testacc TEST=./google/services/pubsub TESTARGS='-run=TestAccPubsubSubscription_bigquery_config_update'
sh -c "'/Users/ramon/go/src/github.com/hashicorp/terraform-provider-google/scripts/gofmtcheck.sh'"
==> Checking that code complies with gofmt requirements...
go vet
TF_ACC_REFRESH_AFTER_APPLY=1 TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test ./google/services/pubsub -v -run=TestAccPubsubSubscription_bigquery_config_update -timeout 240m -ldflags="-X=github.com/hashicorp/terraform-provider-google/version.ProviderVersion=acc"
=== RUN   TestAccPubsubSubscription_bigquery_config_update
=== PAUSE TestAccPubsubSubscription_bigquery_config_update
=== CONT  TestAccPubsubSubscription_bigquery_config_update
--- PASS: TestAccPubsubSubscription_bigquery_config_update (122.95s)
PASS
ok      github.com/hashicorp/terraform-provider-google/google/services/pubsub   126.851s

Waiting for CI to run all the PubSub tests.

Derived from GoogleCloudPlatform/magic-modules#15584