Allow publishing certain documents to client portal

[jackveney]

Allows for publishing certain documents to the client portal. Defaults documents to not publish to client portal.

[github-actions]

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[wrongecho]

Hey @jackveney

Thanks for the PR! Sorry for the delay in coming back to you.

Not sure if you're aware, but currently all documents are visible to technical client contacts within the portal as we have the idea that the documents belong to the clients. The only downside to this is that there's no way to publish selected documents to all contacts, e.g. KB articles (personally I'd like a separate module just for this but who knows).
Is this the challenge this PR is trying to solve?

If we were to move forward with this, it's worth mentioning that to make database changes you need to adjust both db.sql (new installs) and database_updates.php (for existing installs). Also, no changes have been requested to portal/documents.php (or document.php) which would allow the client contacts to actually see the documents.

Thanks in advance!

[wrongecho]

Soft closing for now, feel free to reopen.

[wrongecho]

@jackveney - FYI that this will become a feature via #1035
Default will be that docs are published to the portal.

Please feel free to contribute further via PRs or on the Forum :)