fix: login pages UI

Description

fix: login pages UI

• Used the universal header component on login pages.
• Added application header label into defaultConfig.
• United button colors.
• Allowed log out when a user was not found.

How to test

Run locally. Check for admin-gui, user-profile, publications, password-reset both /login and /service-access login pages. It is recommended to set "auto_auth_redirect": false in instanceConfig.json. Simulate a user loading failure in init-auth.service.ts (method loadPrincipal) and check that the page does not crash and log out button is enabled.

Author's checklist

• I have followed the contribution guidelines
• This MR has been tested or does not change functionality
• I have added relevant merge request dependencies (if this MR has any)
• I have added the correct labels
• I have assigned reviewers (if any are relevant)
• I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation
• I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)

Reviewer's checklist

• This MR has been tested or does not change functionality
• This MR has correct commit message format

Closes STR-1169