Could not resolve "@cloudflare/pages-plugin-mailchannels" error when I make a new push.@cloudflare/pages-plugin-mailchannels still exists and has over 1,000 weekly downloads, which suggests it hasn't been renamed, but I have no experience with Cloudflare Workers and I find the distinction between using Workers and using Pages Functions hazy and confusing, so I don't know how to go about testing the "must be manually added as a dependency first" hypothesis with Git-based deploy (the docs just talk about Wrangler) and it being located in functions/_middleware.ts.