docs: add parameter about preventing password change in local ui

[lennessyy]

Describe the Change

This PR adds a parameter that disables password change using Local UI.

Changed Pages

💻 Installer Reference - Local UI

Jira Tickets

🎫 PE-4474

Backports

Can this PR be backported?

• [ ] Yes. Remember to add the relevant backport labels to your PR.
• [ ] No. Please leave a short comment below about why this PR cannot be backported.

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