fix/Removed duplicate Mistral option

[anshk8]

Summary

• Mistral was shown twice inside the dropdown for adding a Custom or Standard provider
• This PR fixes the UI showing Mistral option twice, one was being displayed for the legacy 'MistralAI' and one for 'Mistral'
• The provider dropdown listed Mistral twice because the frontend enumerated both mistral and legacy mistralai, and both labels are “Mistral AI
• In the backend, inside api/oss/src/core/secrets/dtos.py , Backend already normalizes legacy MistralAI to canonical Mistral lines 100-102, see below

            # Accept the legacy provider slug on input, but persist the canonical value.
            if data.get("kind") == StandardProviderKind.MISTRALAI.value:
                data["kind"] = StandardProviderKind.MISTRAL.value

• Now UI is aligned with backend

Testing

Verified locally

• Locally verified, I can set Mistral API key inside Custom and Standard provider and successfully run a completion inside Playground
• Locally, verified I see one Mistral option

Added or updated tests

N/A

QA follow-up

N/A

Demo

Before:

After:

Checklist

• I have included a video or screen recording for UI changes, or marked Demo as N/A
• Relevant tests pass locally
• Relevant linting and formatting pass locally
• I have signed the CLA, or I will sign it when the bot prompts me

Contributor Resources

• Contributing guide
• Creating your first PR
• Development mode
• Testing
• Formatting and linting
• Slack support

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Pull request overview

This PR aligns the Model Registry “Configure Provider” UI with backend canonicalization by preventing the legacy mistralai provider slug from appearing as a separate option, eliminating the duplicate “Mistral AI” entry in the provider dropdown.

Changes:

• Filtered the legacy SecretDTOProvider.MISTRALAI slug out of the provider dropdown options.
• Normalized any pre-selected legacy mistralai provider value to the canonical mistral when populating the form.

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Pull request overview

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