currently a Go project that exists in Libraries but does not exist anymore will not be marked as "Removed" because we're checking the Go index API, which returns a 200 but wouldn't return any versions. Since we've already decided to only store Go Modules that are on pkg.go.dev, this changes the status url from the API to pkg.go.dev, which returns 404 for non-existent Go Modules.
currently a Go project that exists in Libraries but does not exist anymore will not be marked as "Removed" because we're checking the Go index API, which returns a 200 but wouldn't return any versions. Since we've already decided to only store Go Modules that are on pkg.go.dev, this changes the status url from the API to pkg.go.dev, which returns 404 for non-existent Go Modules.