fix: Privilege Escalation Vulnerability

[NadirJ]

Security Vulnerability: Privilege Escalation

Scenario: An activated LangFlow User can potentially leverage LF APIs to elevate to SuperUser role.

Fix: Enhanced permission validation on the impacted APIs.

[github-actions]

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_{Last Modified at 26 Jul 24 18:33 UTC}

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[ogabrielluiz]

LGTM