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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
3) Yes, you can have granular smart tests. Again, tooling can help. We use Bazel (I wrote a JS-oriented wrapper on top of it called jazelle), which can compute dependency graphs and only test things that changed. For example, with my tool, you can have a master job call jazelle changes to figure out what projects need to be checked given a git diff, and then we distribute the workload across multiple machines to parallelize tests/lint/bundle size analysis/etc (we can do a full run of several thousand compute hours for ~1000 packages in about 20 wall clock minutes). Other similar tools exist for dep graph computation, e.g. turborepo, and to some extent Rush and yarn workspaces + foreach, which might be sufficient for your scale.