[BUG] Session Cookie not working in Proxy mode

[panitaxx]

Describe the bug

The session cookie is not working in proxy mode because it does not gets validated.

To Reproduce
Steps to reproduce the behavior:

1. request any url using the user, roles and xff headers. take note of the cookie.
2. request another url using the cookie with xff but without roles,user header -> 401

Expected behavior

Should be authorized

Plugins
default plugins. security plugins.

Host/Environment (please complete the following information):

• OS: docker ubuntu 20.04
• Version 1.1.0

Additional context

There are two bugs in the validation of the cookie:

In this line:

security-dashboards-plugin/server/auth/types/proxy/proxy_auth.ts

Line 94 in a48786e

username: authInfo.username,

should be:

      username: authInfo.user_name,

and in this line:

security-dashboards-plugin/server/auth/types/proxy/proxy_auth.ts

Line 118 in a48786e

cookie.authType === this.type &&

should be:

	      cookie.authType === this.authType &&