Disable login with local account

This depends on #323.

When login with Azure or Google is configured then local logins can be completely disabled. Add a new property @Value("${allow.local.login:true}") boolean localLoginEnabled; that controls if the Login form shows the username/password form. The same flag should modify the SecurityFilterChain and disable local login processing altogether (if possible).

SOAP

Note that we still need local logins in the SoapAuthenticationInterceptor.

The SOAP endpoints operate on the username and password. This means that GGCE should still have a local password that the user can configure, and this password will only be used in SoapAuthenticationInterceptor.

Edited Aug 02, 2022 by Artem Hrybeniuk

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