Give a warning when using per-project default units (#5956)

* Give a warning when using per-project default units

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Factor non-settings out of MetaSettings

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Fix formatting

* Fix code pane e2e test

* Fix callstack blowup in edit flow

* Avoid dumb timeout issue with command registration in test

* Use a safer way to wait for modeling command registration in test

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>
Co-authored-by: Nick Cameron <nrc@ncameron.org>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Pierre Jacquier <pierre@zoo.dev>
Co-authored-by: Frank Noirot <frankjohnson1993@gmail.com>

src/components/UnitsMenu.tsx

@@ -58,7 +58,6 @@ export function UnitsMenu() {
                         const newCode = changeKclSettings(codeManager.code, {
                           defaultLengthUnits: unitLengthToUnitLen(unit),
                           defaultAngleUnits: { type: 'Degrees' },
-                          stdPath: null,
                         })
                         if (err(newCode)) {
                           toast.error(