PLUGIN-1800: Adding read timeout to BQ Execute Config with default 120s

[masivesky]

https://cdap.atlassian.net/browse/PLUGIN-1800

Retries were already configured on the BigQuery Client by default, 5xx errors are being retried 6 times before failing:

this.retrySettings = (RetrySettings)MoreObjects.firstNonNull(builder.retrySettings, getDefaultRetrySettings());

private static RetrySettings.Builder getDefaultRetrySettingsBuilder() {
    return RetrySettings.newBuilder().setMaxAttempts(6).setInitialRetryDelay(Duration.ofMillis(1000L)).setMaxRetryDelay(Duration.ofMillis(32000L)).setRetryDelayMultiplier(2.0).setTotalTimeout(Duration.ofMillis(50000L)).setInitialRpcTimeout(Duration.ofMillis(50000L)).setRpcTimeoutMultiplier(1.0).setMaxRpcTimeout(Duration.ofMillis(50000L));
  }

Hence, increasing the read timeout for BigQuery Execute action plugin (where we are validating SQL) to a default of 120s. Earlier timeout was the BigQuery default of 20s.

Confirmed via local sandbox testing that the default timeout for BigQuery Execute is 120s.

[itsankit-google]

Please update the markdown as well.

[masivesky]

Please update the markdown as well.

As discussed offline, we will be keeping this new parameter hidden, hence not adding it to the markdown files.