[lockfile] Fix tidy for non-versioned packages (#2313)

## Summary

Fixes issue introduced in #2277

This comment explains it pretty well:
https://github.com/jetify-com/devbox/pull/2277/files#r1767085866

except:

> I think this doesn't matter in practice, because we always append
@latest during devbox add <name>.

This is not 100% true. In the very small number of packages that are not
in nixhub but are valid attribute paths, (e.g. `stdenv.cc.cc.lib`) we
store the key in the lockfile without `@latest` :(. The key missmatch
caused lockfile.Tidy to remove entries.

My bad for making the suggestion that lead to this, this was really
subtle difference.

## How was it tested?

Added `stdenv.cc.cc.lib` on devbox.json linux only, installed on linux
and copied over lockfile to macos. Did `devbox install` and ensured
lockfile was not modified.

internal/devbox/devbox.go

@@ -853,8 +853,8 @@ func (d *Devbox) flakeDir() string {
 // flakes  (lockfile vs devbox list)
 func (d *Devbox) AllPackageNamesIncludingRemovedTriggerPackages() []string {
 	result := []string{}
-	for _, p := range d.AllPackagesIncludingRemovedTriggerPackages() {
-		result = append(result, p.Versioned())
+	for _, p := range d.cfg.Packages(true /*includeRemovedTriggerPackages*/) {
+		result = append(result, p.VersionedName())
 	}
 	return result
 }