Remove nose from unittests (#54055)

* Remove nose from unittests

This PR migrates the last of our unittests from using nose to using
pytest.  We don't need to install nose in our testing environments
anymore

docs/docsite/rst/community/documentation_contributions.rst

@@ -62,18 +62,15 @@ If you make multiple changes to the documentation, or add more than a line to it
 
 To work with documentation on your local machine, you need the following packages installed:
 
-.. code-block:: none
-
-   - libyaml
-   - PyYAML
-   - nose
-   - six
-   - tornado
-   - pyparsing
-   - gcc
-   - jinja2
-   - rstcheck
-   - sphinx
+- libyaml
+- PyYAML
+- six
+- tornado
+- pyparsing
+- gcc
+- jinja2
+- rstcheck
+- sphinx
 
 .. note::