APIs pending stability updates in v0.40.0

[github-actions]

Preview APIs due to become stable

• cephfs: FileBlockDiffInit
• cephfs: FileBlockDiffInfo.Close
• cephfs: FileBlockDiffInfo.More
• cephfs: FileBlockDiffInfo.Read
• rgw/admin: API.CreateAccount
• rgw/admin: API.GetAccount
• rgw/admin: API.DeleteAccount
• rgw/admin: API.ModifyAccount

Deprecated APIs due to be removed

n/a

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