add shib auth support for redirect url

[mrow4a]

Description

Without this change, server-side Apache Auth (e.g. Shibboleth) resulted in redirect to default owncloud page, instead of last visited page. We now correctly handle redirect_url.

Related Issue

• Fixes https://github.com/owncloud/enterprise/issues/5450
• Related Complete apache auth (SAML/SSO) flow with redirect page #40161

How Has This Been Tested?

• manually in internal oc2.lab test instance

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Base code changes
• Make sure to handle corner cases in login
• Unit tests added
• Acceptance tests added
• Changelog item, see TEMPLATE

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[ownclouders]

💥 Acceptance tests pipeline apiFederationToShares2-latest-mariadb10.2-php7.4 failed. The build has been cancelled.

https://drone.owncloud.com/owncloud/core/37187/103

[ownclouders]

💥 Acceptance tests pipeline apiShareOperationsToRoot1-mariadb10.2-php7.4 failed. The build has been cancelled.

https://drone.owncloud.com/owncloud/core/37185/55

[ownclouders]

💥 Acceptance tests pipeline apiShareManagementToRoot-mariadb10.2-php7.4 failed. The build has been cancelled.

https://drone.owncloud.com/owncloud/core/37185/51

[ownclouders]

💥 Acceptance tests pipeline apiShareManagementToShares-mariadb10.2-php7.4 failed. The build has been cancelled.

https://drone.owncloud.com/owncloud/core/37185/52