Restores `--json` / `--parseable` / `--long` support on `pnpm -g ls` and tightens `--depth>0` semantics around isolated global installs. Closes#11440.
- **`--json` / `--parseable` (the regression):** aggregate global packages from all isolated install dirs into a single synthesized `PackageDependencyHierarchy` and dispatch to the existing `renderJson` / `renderParseable` / `renderTree`. Output shape matches pnpm 10 (`result[0].dependencies[name].version`), so tools like `npm-check-updates` work again.
- **`--depth>0`:** the v11 architecture installs each global package into its own isolated dir with its own lockfile, so merging transitive trees across installs would be incoherent. New behavior:
- One global install dir total → fast-path delegate to the regular `list` flow with `params` unchanged, so `listForPackages` can match top-level *or* transitive packages.
- Multiple installs, params narrow to one install dir (top-level alias match) → drop the params and render that install dir's full tree.
- Multiple installs, params don't narrow → throw `ERR_PNPM_GLOBAL_LS_DEPTH_NOT_SUPPORTED` with a message asking the user to filter to a single global package or omit `--depth`.
The regression was introduced by the isolated global packages refactor (#10697), which added a custom `listGlobalPackages` shortcut that always returned plain text and ignored format flags.