feat: deprecating daos_version field

feat: Adding `deployment_type` field
docs: updated documentation for field `daos_version` in message `.google.cloud.parallelstore.v1.Instance` to reflect that the field is deprecated.
docs: Updated field `file_stripe_level` in message `.google.cloud.parallelstore.v1.Instance` to reflected that message is now immutable
docs: updated `directory_stripe_level` in message `.google.cloud.parallelstore.v1.Instance` to reflect that the field is now immutable

PiperOrigin-RevId: 726614548

Source-Link: googleapis/googleapis@a003cab

Source-Link: googleapis/googleapis-gen@0987b56
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