Wizard: Add kernel append input

This adds the kernel append input. New arguments can be added by pressing the "Add" button or hitting Enter after the argument.

The kernel arguments linked to a selected OpenSCAP profile are rendered in a category marked as "Required by OpenSCAP" and are read only.

src/Components/CreateImageWizard/utilities/requestMapper.ts

@@ -336,7 +336,7 @@ function commonRequestToState(
     },
     kernel: {
       name: request.customizations.kernel?.name || '',
-      append: request.customizations?.kernel?.append || '',
+      append: request.customizations?.kernel?.append?.split(' ') || [],
     },
     timezone: {
       timezone: request.customizations.timezone?.timezone || '',
@@ -763,13 +763,25 @@ const getPayloadRepositories = (state: RootState) => {
 
 const getKernel = (state: RootState) => {
   const kernel = selectKernel(state);
+  const kernelAppendString = selectKernel(state).append.join(' ');
 
-  if (!kernel.name && !kernel.append) {
+  const kernelRequest = {};
+
+  if (!kernel.name && kernel.append.length === 0) {
     return undefined;
   }
 
-  return {
-    name: selectKernel(state).name || undefined,
-    append: selectKernel(state).append || undefined,
-  };
+  if (kernel.name) {
+    Object.assign(kernelRequest, {
+      name: kernel.name,
+    });
+  }
+
+  if (kernelAppendString !== '') {
+    Object.assign(kernelRequest, {
+      append: kernelAppendString,
+    });
+  }
+
+  return Object.keys(kernelRequest).length > 0 ? kernelRequest : undefined;
 };