[self-hosted-pro] formalize the "admin" user accounts

[stefannica]

Contact Details [Optional]

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Feature Description

We currently only support one "admin" user account in the self-hosted version that lives in memory and cannot be managed as a regular user account. We should formalize "admin" user accounts:

• allow any user account to be an "admin"
• add this to the existing dashboard user account management

Problem or Use Case

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Proposed Solution

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Alternatives Considered

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Additional Context

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Priority

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