Add support for the Privacy Portal OAUTH provider

[privacyguard]

This PR adds support for SSO with Privacy Portal.

Related Issue: #792

OAUTH Provider: https://privacyportal.org

Mbin Configuration:
OAUTH_PRIVACYPORTAL_ID=<CLIENT_ID obtained from https://app.privacyportal.org >
OAUTH_PRIVACYPORTAL_SECRET=<CLIENT_SECRET obtained from https://app.privacyportal.org >

Provider Specific Information:

• Emails provided are Privacy Aliases which means there can never be a match with existing user emails in the DB
• Privacy Portal uses Passwordless Authentication

[ghost]

You'll need to update:

mbin/src/Entity/User.php

Lines 762 to 765 in 9b207e2

	public function isSsoControlled(): bool
	{
	return $this->oauthAzureId || $this->oauthGithubId || $this->oauthGoogleId || $this->oauthFacebookId || $this->oauthKeycloakId || $this->oauthSimpleLoginId || $this->oauthZitadelId || $this->oauthAuthentikId;
	}

to include Privacy Portal

[privacyguard]

@nobodyatroot Thanks for catching this!

[ghost]

LGTM

[privacyguard]

@nobodyatroot Thanks for the quick review!