feat: [DatabaseCenter] A new value SUB_RESOURCE_TYPE_READ_POOL is added to enum SubResourceType (#9036)

* feat: A new value `SUB_RESOURCE_TYPE_READ_POOL` is added to enum `SubResourceType`
feat: A new value `SUB_RESOURCE_TYPE_RESERVATION` is added to enum `SubResourceType`
feat: A new value `SUB_RESOURCE_TYPE_DATASET` is added to enum `SubResourceType`
feat: A new value `SIGNAL_TYPE_VERSION_NEARING_END_OF_LIFE` is added to enum `SignalType
docs: Modified comment for Edition Enum

PiperOrigin-RevId: 887887716

Source-Link: googleapis/googleapis@28d90ca

Source-Link: googleapis/googleapis-gen@c0c1b55
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