feat: disable proconnect connexion for communes

[MaGOs92]

No description provided.

[Copilot]

Pull request overview

This PR prevents ProConnect authentication for organizations identified as communes (mairies), and surfaces a structured error to the frontend including a link to Mes Adresses.

Changes:

• Extend INSEE org lookup to detect communes (legal category 7210) and return codeCommune.
• Block ProConnect callback for communes with a FORBIDDEN error that includes a Mes Adresses redirect link.
• Update controller redirect logic and integration tests to accommodate new error shapes/messages.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/tests/proconnect.spec.ts	Updates existing integration tests and adds coverage for commune rejection (with Mes Adresses link).
src/modules/proconnect/proconnect.service.ts	Adds commune blocking logic and switches some errors to structured HttpException payloads.
src/modules/proconnect/proconnect.controller.ts	Redirects FORBIDDEN errors to frontend with error/errorLink query params.
src/modules/proconnect/insee.service.ts	Adds isCommune + codeCommune inference from INSEE response.

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