Admin error loading import_from_csv template

#### Describe the bug
Wagtail CRX Admin fails to load page template when clicking 'Import from CSV file'

#### Steps to reproduce
Steps to reproduce the behavior:
Wagtail CRX Admin fails to load template when clicking 'Import from CSV file'

Error:
TemplateDoesNotExist at /admin/codered/import-export/import_from_csv/
wagtailadmin/shared/field_as_li.html

#### Expected behavior
Import page should load

#### Additional context
The Wagtail team removed shared include `field_as_li.html` in release 5.1:
https://github.com/wagtail/wagtail/blob/0506449cbbe85e213a7aaad7092b9c5f36fef8d2/docs/releases/5.1.md?plain=1#L385

It needs to be replaced with "wagtailadmin/shared/field.html" wrapped within `li` tags.

Import from CSV still references it:
https://github.com/coderedcorp/coderedcms/blame/main/coderedcms/templates/wagtailimportexport/import_from_csv.html

{% for field in form %}
{% include "wagtailadmin/shared/field_as_li.html" %}
{% endfor %}

从 coderedcms/templates/wagtailimportexport/import_from_csv.html 开始，检查对已移除共享模板的引用。运行从 CSV 导入的管理页面以复现 TemplateDoesNotExist 错误；在 Wagtail 5.1 或更高版本上，页面能够在没有该缺失模板的情况下成功加载即表示完成。

由索引模型根据 Issue 内容生成。