fix(sso|auth): fix sso signinup

[AMoreaux]

Renamed user to payload for better context clarity and updated related references. Adjusted the login token generation to use workspace.id, improving readability and maintainability of the code.

[greptile-apps]

PR Summary

Improved SSO authentication flow by renaming parameters and updating workspace reference handling in the login token generation process.

• Renamed user parameter to payload in generateLoginToken() in packages/twenty-server/src/engine/core-modules/auth/controllers/sso-auth.controller.ts for better semantic clarity
• Updated workspace reference to use workspace.id from signInUp() return value instead of identityProvider.workspace.id for more reliable workspace identification
• Improved type safety by ensuring workspace reference comes from the post-authentication state

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[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-f265c195.json

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