fix: standardize password fields to use HiddenInput component for con…

[Achieve3318]

…sistency

This commit replaces all remaining plain password input fields with the HiddenInput component to ensure consistent UX across all password fields in the monitor configuration form. The HiddenInput component provides a show/hide toggle button for better usability.

Changes:

• MQTT password field now uses HiddenInput
• Radius password and secret fields now use HiddenInput
• Kafka SASL password fields now use HiddenInput
• OAuth client secret field now uses HiddenInput
• Basic auth password field now uses HiddenInput

This improves user experience by allowing users to toggle password visibility consistently across all authentication fields.

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📝 Summary of changes done and why they are done

📋 Related issues

• Relates to #issue-number
• Resolves #issue-number

📄 Checklist

Please follow this checklist to avoid unnecessary back and forth (click to expand)

• ⚠️ If there are Breaking change (a fix or feature that alters existing functionality in a way that could cause issues) I have called them out
• 🧠 I have disclosed any use of LLMs/AI in this contribution and reviewed all generated content.
  I understand that I am responsible for and able to explain every line of code I submit.
• 🔍 My code adheres to the style guidelines of this project.
• ⚠️ My changes generate no new warnings.
• 🛠️ I have reviewed and tested my code.
• 📝 I have commented my code, especially in hard-to-understand areas (e.g., using JSDoc for methods).
• 🤖 I added or updated automated tests where appropriate.
• 📄 Documentation updates are included (if applicable).
• 🔒 I have considered potential security impacts and mitigated risks.
• 🧰 Dependency updates are listed and explained.

📷 Screenshots or Visual Changes

• UI Modifications: Highlight any changes made to the user interface.
• Before & After: Include screenshots or comparisons (if applicable).

Event	Before	After
UP
DOWN
Certificate-expiry
Testing

[CommanderStorm]

LGTM, thanks