feat(cloudbilling): update the api

#### cloudbilling:v1beta

The following keys were added:
- schemas.CacheFillRegions (Total Keys: 4)
- schemas.CloudCdnEgressWorkload (Total Keys: 4)
- schemas.CloudCdnWorkload (Total Keys: 6)
- schemas.CloudInterconnectEgressWorkload (Total Keys: 4)
- schemas.CloudInterconnectWorkload (Total Keys: 7)
- schemas.CloudStorageEgressWorkload (Total Keys: 5)
- schemas.PremiumTierEgressWorkload (Total Keys: 5)
- schemas.StandardTierEgressWorkload (Total Keys: 4)
- schemas.VlanAttachment (Total Keys: 4)
- schemas.Workload.properties.cloudCdnEgressWorkload.$ref (Total Keys: 1)
- schemas.Workload.properties.cloudCdnWorkload.$ref (Total Keys: 1)
- schemas.Workload.properties.cloudInterconnectEgressWorkload.$ref (Total Keys: 1)
- schemas.Workload.properties.cloudInterconnectWorkload.$ref (Total Keys: 1)
- schemas.Workload.properties.cloudStorageEgressWorkload.$ref (Total Keys: 1)
- schemas.Workload.properties.premiumTierEgressWorkload.$ref (Total Keys: 1)
- schemas.Workload.properties.standardTierEgressWorkload.$ref (Total Keys: 1)

Author: yoshi-automation