Add missing issuer to discord provider config

[jariz]

☕️ Reasoning

The discord provider currently doesn't work out of the box and needs the issuer to be manually added like so:

    Discord({
      issuer: "https://discord.com",
    }),

I believe this should be in the provider config by default as the provider does not work at all without adding this right now.

🧢 Checklist

• [x] Documentation
• [x] Tests
• [x] Ready to be merged

🎫 Affected issues

Fixes: #12687

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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[panva]

@balazsorban44 when the current config stops working is if users request the openid scope, at that point an ID Token is returned and validation fails, the expected issuer is absolutely required in that case.