feat(providers): make issuer configurable on Salesforce

[balazsorban44]

Fixes #4200

☕️ Reasoning

What changes are being made? What feature/bug is being fixed here?

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

Please scout and link issues that might be solved by this PR.

Fixes: INSERT_ISSUE_LINK_HERE

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Name	Status	Preview	Updated
next-auth	🔄 Building (Inspect)		May 31, 2022 at 5:02PM (UTC)

[mrcampbell]

Are there updated docs for this? All my apps started crashing after this update with this error:

[next-auth][error][OAUTH_CALLBACK_ERROR] 
https://next-auth.js.org/errors#oauth_callback_error unexpected iss value, expected undefined, got: https://login.salesforce.com {
  error: {
    message: 'unexpected iss value, expected undefined, got: https://login.salesforce.com',
    stack: 'RPError: unexpected iss value, expected undefined, got: https://login.salesforce.com\n' +
      '    at Client.validateJWT (/Users/mikecampbell/shep-fly/core/node_modules/openid-client/lib/client.js:906:15)\n' +
      '    at Client.validateIdToken (/Users/mikecampbell/shep-fly/core/node_modules/openid-client/lib/client.js:741:60)\n' +
      '    at Client.callback (/Users/mikecampbell/shep-fly/core/node_modules/openid-client/lib/client.js:486:18)\n' +
      '    at processTicksAndRejections (node:internal/process/task_queues:96:5)\n' +
      '    at async oAuthCallback (/Users/mikecampbell/shep-fly/core/node_modules/next-auth/core/lib/oauth/callback.js:112:16)\n' +
      '    at async Object.callback (/Users/mikecampbell/shep-fly/core/node_modules/next-auth/core/routes/callback.js:50:11)\n' +
      '    at async NextAuthHandler (/Users/mikecampbell/shep-fly/core/node_modules/next-auth/core/index.js:176:28)\n' +
      '    at async NextAuthNextHandler (/Users/mikecampbell/shep-fly/core/node_modules/next-auth/next/index.js:23:19)\n' +
      '    at async /Users/mikecampbell/shep-fly/core/node_modules/next-auth/next/index.js:59:32\n' +
      '    at async Object.apiResolver (/Users/mikecampbell/shep-fly/core/node_modules/next/dist/server/api-utils/node.js:185:9)',
    name: 'RPError'
  },
  providerId: 'salesforce',
  message: 'unexpected iss value, expected undefined, got: https://login.salesforce.com'
}

358b80d#commitcomment-77141516