chore: make Edge instance node width consistent (#9335)

https://linear.app/unleash/issue/2-3295/make-edge-instance-nodes-width-consistent-in-the-connected-edges-view

When manually testing this feature I noticed that sometimes Edge
instance nodes had different widths depending on their content.

This makes it so they stretch to the available space, making all
instance nodes in a group (app-name) the same width.

frontend/src/component/admin/network/NetworkConnectedEdges/NetworkConnectedEdgeInstance.tsx

@@ -15,6 +15,7 @@ import { HelpIcon } from 'component/common/HelpIcon/HelpIcon';
 import { NetworkConnectedEdgeInstanceLatency } from './NetworkConnectedEdgeInstanceLatency';
 
 const StyledInstance = styled('div')(({ theme }) => ({
+    width: '100%',
     borderRadius: theme.shape.borderRadiusMedium,
     border: '1px solid',
     borderColor: theme.palette.secondary.border,