Two small UX changes on the public Marketplace surface.
1. Become-a-Partner CTA next to the Partners collection
Renders a "Become a Partner" external link next to the description
of the Partners collection on both Plugin and Template marketplace
listing pages. Targets the HubSpot intake form
https://share-na2.hsforms.com/1NiS4r9lsSqGcuNBB77DeEQ40s9fk.
Plugin marketplace stores this collection as `partners`, Template
marketplace as `Partner Template`; we match both names so the CTA
shows up on either listing.
2. Workflow preview no longer hijacks the page scroll
In `WorkflowPreview`, the ReactFlow canvas now sets
`zoomOnScroll={false}` and `preventScrolling={false}`. The mouse
wheel over a workflow preview (template detail page, etc.) keeps
scrolling the surrounding page instead of either zooming the
canvas or eating the wheel event. Zoom is still available via the
ZoomInOut buttons in the bottom-left corner.