bug(gobinaries): empty Package for gobinaries without main information

[DmitriyLewen]

Description

There are times when gobinaries don't contain Main information.
e.g.:

➜ go version -m go
go: go1.22.2
	path	cmd/go
	build	-buildmode=exe
	build	-compiler=gc
	build	-gcflags=cmd/...=-dwarf=false
	build	-trimpath=true
	build	DefaultGODEBUG=httplaxcontentlength=1,httpmuxgo121=1,panicnil=1,tls10server=1,tlsrsakex=1,tlsunsafeekm=1
	build	CGO_ENABLED=0
	build	GOARCH=arm64
	build	GOOS=darwin
➜ go version -m gofmt
gofmt: go1.22.2
	path	cmd/gofmt
	build	-buildmode=exe
	build	-compiler=gc
	build	-gcflags=cmd/...=-dwarf=false
	build	-trimpath=true
	build	DefaultGODEBUG=httplaxcontentlength=1,httpmuxgo121=1,panicnil=1,tls10server=1,tlsrsakex=1,tlsunsafeekm=1
	build	CGO_ENABLED=0
	build	GOARCH=arm64
	build	GOOS=darwin

We don't need to add empty root Packages for these binaries.

Discussed in #6693