Wizard: Add temporary alert about /usr sub-directories

This adds an alert to the File system configuration step that informs about newly disables `/usr` sub-directories.

It can be removed in two weeks after all the images with possible erroneous mount points are removed.

src/Components/CreateImageWizard/formComponents/FileSystemConfiguration.js

@@ -24,6 +24,7 @@ import { v4 as uuidv4 } from 'uuid';
 
 import MountPoint, { MountPointValidPrefixes } from './MountPoint';
 import SizeUnit from './SizeUnit';
+import UsrSubDirectoriesDisabled from './UsrSubDirectoriesDisabled';
 
 import { UNIT_GIB, UNIT_KIB, UNIT_MIB } from '../../../constants';
 import { useGetOscapCustomizationsQuery } from '../../../store/imageBuilderApi';
@@ -307,6 +308,9 @@ const FileSystemConfiguration = ({ ...props }) => {
           <TextContent>
             <Text component={TextVariants.h3}>Configure partitions</Text>
           </TextContent>
+          {getState()?.values?.['file-system-configuration']?.find((mp) =>
+            mp.mountpoint.includes('/usr')
+          ) && <UsrSubDirectoriesDisabled />}
           {rows.length > 1 &&
             getState()?.errors?.['file-system-configuration']?.duplicates
               ?.length !== 0 &&

src/Components/CreateImageWizard/formComponents/ReviewStep.js

@@ -24,6 +24,7 @@ import {
   TargetEnvOciList,
   TargetEnvOtherList,
 } from './ReviewStepTextLists';
+import UsrSubDirectoriesDisabled from './UsrSubDirectoriesDisabled';
 
 import isRhel from '../../../Utilities/isRhel';
 
@@ -66,6 +67,9 @@ const ReviewStep = () => {
   return (
     <>
       <RepositoryUnavailable />
+      {getState()?.values?.['file-system-configuration']?.find((mp) =>
+        mp.mountpoint.includes('/usr')
+      ) && <UsrSubDirectoriesDisabled />}
       <ExpandableSection
         toggleContent={'Image output'}
         onToggle={(_event, isExpandedImageOutput) =>

src/Components/CreateImageWizard/formComponents/UsrSubDirectoriesDisabled.js

@@ -0,0 +1,19 @@
+import React from 'react';
+
+import { Alert } from '@patternfly/react-core';
+
+const UsrSubDirectoriesDisabled = () => {
+  return (
+    <Alert
+      variant="warning"
+      title="Sub-directories for the /usr mount point are no longer supported"
+      isInline
+    >
+      Please note that including sub-directories in the /usr path is no longer
+      supported. Previously included mount points with /usr sub-directory are
+      replaced by /usr when recreating an image.
+    </Alert>
+  );
+};
+
+export default UsrSubDirectoriesDisabled;