feat(bigqueryreservation): update the api

#### bigqueryreservation:v1

The following keys were added:
- resources.projects.resources.locations.resources.reservations.resources.assignments.methods.getIamPolicy (Total Keys: 14)
- resources.projects.resources.locations.resources.reservations.resources.assignments.methods.setIamPolicy (Total Keys: 12)
- resources.projects.resources.locations.resources.reservations.resources.assignments.methods.testIamPermissions (Total Keys: 12)
- schemas.FailoverReservationRequest.properties.failoverMode.type (Total Keys: 1)
- schemas.ReplicationStatus.properties.softFailoverStartTime (Total Keys: 3)

Author: yoshi-automation