Remove portal restrictions and "free preview" language

[robyngit]

We have decided not to restrict access to DataONE portals through the fee system. MetacatUI should no longer use Bookkeeper, DataONE Plus preview status, subject allowlists, or a finite portal quota to decide whether a signed in user can create a portal. Preview status should also not prevent a portal from being viewed or edited in the DataONE catalog, or prevent an owner from choosing its URL.

The DataONE theme currently sets enableBookkeeperServices: true, dataonePlusPreviewMode: true, and portalLimit: 5. Other repository themes also contain creation restrictions: KNB and DRP set limitPortalsToSubjects, and Arctic sets portalLimit: 999. There is no working unlimited portalLimit value at the moment; when Bookkeeper is disabled, the portal list treats 0 as already at the limit.

• Allow portal creation without a Bookkeeper quota or finite portalLimit.
• Update the DataONE theme defaults to keep enableCreatePortals enabled, disable Bookkeeper and preview mode, and remove the preview portal list and finite portal limit.
• Audit all MetacatUI deployment overrides, including search.dataone.org, Arctic Data Center, KNB, DRP, and hosted repositories, and remove the temporary subject allowlists, quotas, and preview settings.
• Remove or disable (with feature flag) the "free preview" behaviour that generates a random portal label and disables the custom portal URL.
• Remove portal specific fee language, including the "free preview" editor messages, membership level quota message, and subscription upgrade tooltip.
• Update the DataONE theme's embedded nav bar and footer when the corresponding DataONE website language has been changed.

Relevant settings: enableCreatePortals, limitPortalsToSubjects, portalLimit, and enableBookkeeperServices.