feat: support password resets from the api

[shreddedbacon]

Checklist

• Affected Issues have been mentioned in the Closing issues section
• Documentation has been written/updated
• PR title is ready for inclusion in changelog

Add support to the API to allow new users trigger a password reset email. The lifespan is set for 12 hours (this could be configurable?). The password reset will also contain the redirect information to send the user back to the Lagoon UI. But an environment variable LAGOON_UI needs to be injected into the API deployment with the URL for the UI (eg. https://dashboard.amazeeio.cloud)

mutation addUser{
  addUser(input:{
    email: "user@example.com"
    resetPassword: true
  }){
    email
  }
}

Or perform a password reset action directly

mutation resetPassword{
  resetUserPassword(input:{
    user: {
      email: "user@example.com"
    }
  })
}

Closing issues

closes #2501

[tobybellwood]

Tested and working as intended