fix(grid): move controls when changing content placement (#6350)

**Problem:**
Today the grid controls placeholder don't move when changing `content`
placement

![10-45-psczv-wnkpg](https://github.com/user-attachments/assets/ea5d2623-0705-4337-8aa2-6d0139addec8)
 

**Fix:**
Copy `justifyContent` and `alignContent` props to the grid placeholder
as well.

<video
src="https://github.com/user-attachments/assets/0e8dfd6e-f6ca-4b46-bd83-89b2472d03a8"></video>

**Note:**
We should discuss how we can avoid these kinds of issues in the future -
where there might be a future grid style prop that will not be copied to
the grid control

**Manual Tests:**
I hereby swear that:

- [X] I opened a hydrogen project and it loaded
- [X] I could navigate to various routes in Preview mode

editor/src/components/canvas/__snapshots__/ui-jsx-canvas-bugs.spec.tsx.snap

@@ -158,6 +158,7 @@ Object {
     "label": null,
     "nonRoundedGlobalFrame": null,
     "specialSizeMeasurements": Object {
+      "alignContent": null,
       "alignItems": null,
       "borderRadius": null,
       "clientHeight": 0,
@@ -304,6 +305,7 @@ Object {
     "label": null,
     "nonRoundedGlobalFrame": null,
     "specialSizeMeasurements": Object {
+      "alignContent": null,
       "alignItems": null,
       "borderRadius": null,
       "clientHeight": 0,