docs: strip ansi and exclude outputs from search (#4460)

# Changes

* Strip ANSI codes from outputs
* Exclude outputs from search (relies on an insiders feature, so can't
test locally)

## ANSI Changes

Before


![image](https://github.com/user-attachments/assets/6ca626f3-143b-4f7a-ab4a-0866f0bbf52f)


After


![image](https://github.com/user-attachments/assets/3d2fdb4f-79a0-42d5-9956-e2aa44e3fea2)

docs/_scripts/notebook_convert_templates/mdoutput/index.md.j2

@@ -4,18 +4,21 @@
 ```output
 {{ line.rstrip() | strip_ansi }}
 ```
+{ mkdocs-exclude-search }
 {%- endblock traceback_line -%}
 
 {%- block stream -%}
 ```output
-{{ output.text.rstrip() }}
+{{ output.text.rstrip() | strip_ansi }}
 ```
+{ mkdocs-exclude-search }
 {%- endblock stream -%}
 
 {%- block data_text scoped -%}
 ```output
-{{ output.data['text/plain'].rstrip() }}
+{{ output.data['text/plain'].rstrip() | strip_ansi }}
 ```
+{ mkdocs-exclude-search }
 {%- endblock data_text -%}
 
 {%- block data_html scoped -%}