V2 Wizard: Add custom file system to request customizations (HMS-3690)

The blueprint request now contains a field for the filesystem in its
customizations.

src/Components/CreateImageWizardV2/steps/FileSystem/FileSystemTable.tsx

@@ -160,6 +160,7 @@ const FileSystemTable = () => {
       className={isDragging ? styles.modifiers.dragOver : ''}
       aria-label="File system table"
       variant="compact"
+      data-testid="fsc-table"
     >
       <Thead>
         <Tr>