Is it necessary to use meta tags on administration pages?

Meta tags , even description and keywords can be useful for other things. They are documenters for their own use. So if you have any reason to use them, use. If you can not find a reason, you do not have to use it.

Others change the behavior of the browser in how to render the page. Example:

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" >

Even on an administration page this has some influence, not fundamental. Without it maybe your page will render wrong. Note that "utf-8" was just an example, could be other encondigs .

<meta http-equiv="refresh" content="5" />

Another example that creates an action in the browser.

You are obviously correct that for SEO they will not do. In fact there are controversies if your use for SEO is actually useful. Google does not use them for indexing itself.

I believe that the "Keywords" and "Description" goals can be ignored in the administration part of the site, but it is worthwhile to use the Meta Title so that the accustomed user can find it.