Go packge info paths are incorrect according to package specs

[goddenrich]

https://pkg.go.dev/golang.org/x/tools/go/packages#Package specifies

type Package struct {
	// ID is a unique identifier for a package,
	// in a syntax provided by the underlying build system.
	//
	// Because the syntax varies based on the build system,
	// clients should treat IDs as opaque and not attempt to
	// interpret them.
	ID [string](https://pkg.go.dev/builtin#string)

	// Name is the package name as it appears in the package source code.
	Name [string](https://pkg.go.dev/builtin#string)

	// PkgPath is the package path as used by the go/types package.
	PkgPath [string](https://pkg.go.dev/builtin#string)

	// Dir is the directory associated with the package, if it exists.
	//
	// For packages listed by the go command, this is the directory containing
	// the package files.
	Dir [string](https://pkg.go.dev/builtin#string)

	// Errors contains any errors encountered querying the metadata
	// of the package, or while parsing or type-checking its files.
	Errors [][Error](https://pkg.go.dev/golang.org/x/tools/go/packages#Error)

	// TypeErrors contains the subset of errors produced during type checking.
	TypeErrors [][types](https://pkg.go.dev/go/types).[Error](https://pkg.go.dev/go/types#Error)

	// GoFiles lists the absolute file paths of the package's Go source files.
	// It may include files that should not be compiled, for example because
	// they contain non-matching build tags, are documentary pseudo-files such as
	// unsafe/unsafe.go or builtin/builtin.go, or are subject to cgo preprocessing.
	GoFiles [][string](https://pkg.go.dev/builtin#string)

	// CompiledGoFiles lists the absolute file paths of the package's source
	// files that are suitable for type checking.
	// This may differ from GoFiles if files are processed before compilation.
	CompiledGoFiles [][string](https://pkg.go.dev/builtin#string)

	// OtherFiles lists the absolute file paths of the package's non-Go source files,
	// including assembly, C, C++, Fortran, Objective-C, SWIG, and so on.
	OtherFiles [][string](https://pkg.go.dev/builtin#string)

	// EmbedFiles lists the absolute file paths of the package's files
	// embedded with go:embed.
	EmbedFiles [][string](https://pkg.go.dev/builtin#string)

	// EmbedPatterns lists the absolute file patterns of the package's
	// files embedded with go:embed.
	EmbedPatterns [][string](https://pkg.go.dev/builtin#string)

	// IgnoredFiles lists source files that are not part of the package
	// using the current build configuration but that might be part of
	// the package using other build configurations.
	IgnoredFiles [][string](https://pkg.go.dev/builtin#string)

	// ExportFile is the absolute path to a file containing type
	// information for the package as provided by the build system.
	ExportFile [string](https://pkg.go.dev/builtin#string)

	// Target is the absolute install path of the .a file, for libraries,
	// and of the executable file, for binaries.
	Target [string](https://pkg.go.dev/builtin#string)

	// Imports maps import paths appearing in the package's Go source files
	// to corresponding loaded Packages.
	Imports map[[string](https://pkg.go.dev/builtin#string)]*[Package](https://pkg.go.dev/golang.org/x/tools/go/packages#Package)

	// Module is the module information for the package if it exists.
	//
	// Note: it may be missing for std and cmd; see Go issue #65816.
	[Module](https://pkg.go.dev/golang.org/x/tools/go/packages#Module) *Module
}

In particular all paths should be absolute paths not relative paths. However the paths provided are relative paths to the root of the repo. https://github.com/please-build/go-rules/blob/master/tools/please_go/packageinfo/packageinfo.go#L133.