feat: add logged out url config

[lookacat]

Description

Introduce a config to set the more button url on the access denied page in web via WEB_OPTION_ACCESS_DENIED_HELP_URL.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[mmattel]

Question: when having webfinger:
One can provide a generic URL that the client uses to get via webfinger the final URL. This URL can by nature differ from the given one (think about a legal independent subsidery of a company) and by that using the new envvars here, the pages defined here are generic and can not contain content that differs per subsidery. Thinking into the future and when having a big corporation, they most likely want to have a page aligned to the resolved webfinger address (subsidery).

If this is not the case or doable, we then have to add some text in the web service readme to declare the behavior/situation when using webfinger.

[kulmann]

Question: when having webfinger: One can provide a generic URL that the client uses to get via webfinger the final URL. This URL can by nature differ from the given one (think about a subsidery of a company) and by that using the new envvars here, the pages defined here are generic and can not contain content that differs per subsidery. Thinking into the future and when having a big cooporation, they most likely want to have a page aligned to the resolved webfinger address (subsidery).

If this is not the case or doable, we then have to add some text in the web service readme to declare the behavior/situation when using webfinger.

This config is already per instance, so it is always from the perspective of the ocis instance that was resolved for the user via webfinger.

[mmattel]

LGTM from a docs pov

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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