Replace Zendesk support form with help link on HCA #4874

Summary

Replace the Zendesk support request form on the HCA Data Explorer with a ViewSupport FAB linking to a TBD help page, following the same pattern as #4872 (AnVIL).

Current behavior

The HCA floating layout in site-config/hca-dcp/ma-dev/layout/floating.ts configures a SupportRequest component that posts tickets to Zendesk (support.terra.bio). The floating config also includes a CookieBanner component which should be kept.

Desired behavior

Remove the SupportRequest component and Zendesk configuration from the HCA floating layout. Replace with a ViewSupport FAB linking to a help page URL (TBD — blocked on deciding the destination). Keep the CookieBanner component.

Blocked on

• Destination help page URL needs to be determined