scaffolder: add header with context menu to NFS task page

Adds a Header from @backstage/ui with a kebab menu to the individual task
sub-page in the new frontend system, restoring the ability to show/hide
logs and button bar, as well as start over, retry, and cancel actions.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

yarn.lock

@@ -7031,6 +7031,7 @@ __metadata:
     "@backstage/plugin-techdocs-react": "workspace:^"
     "@backstage/test-utils": "workspace:^"
     "@backstage/types": "workspace:^"
+    "@backstage/ui": "workspace:^"
     "@codemirror/language": "npm:^6.0.0"
     "@codemirror/legacy-modes": "npm:^6.1.0"
     "@codemirror/view": "npm:^6.0.0"
@@ -7038,6 +7039,7 @@ __metadata:
     "@material-ui/icons": "npm:^4.9.1"
     "@material-ui/lab": "npm:4.0.0-alpha.61"
     "@react-hookz/web": "npm:^24.0.0"
+    "@remixicon/react": "npm:^4.6.0"
     "@rjsf/core": "npm:5.24.13"
     "@rjsf/material-ui": "npm:5.24.13"
     "@rjsf/utils": "npm:5.24.13"