Closes #17653: Add function to trim whitespaces in export templates via jinja environment settings (#19078)

* Create RenderMixin, and unify template_code rendering and exporting

* Join migrations

* Add DEFAULT_MIME_TE constant

* Move RenderMixin to extras.models.mixins, Rename RenderMixin to RenderTemplateMixin

* Add render_jinja2 to __all__

* Rename ConfigTemplateFilterForm rendering FieldSet

* ConfigTemplate lint

* Simplify ExportTemplate get_context

* Fix table order, and add fields for translations

* Update Serializers

* Update forms, tables, graphQL, API

* Add extra tests for ConfigTemplate and ExportTemplate

* Documentation update

* Fix typo

* Misc cleanup

* Clean up template layouts

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

docs/models/extras/exporttemplate.md

@@ -20,6 +20,12 @@ Template code may optionally be sourced from a remote [data file](../core/datafi
 
 Jinja2 template code for rendering the exported data.
 
+### Environment Parameters
+
+!!! info "This field was introduced in NetBox v4.3."
+
+A dictionary of any additional parameters to pass when instantiating the [Jinja2 environment](https://jinja.palletsprojects.com/en/3.1.x/api/#jinja2.Environment). Jinja2 supports various optional parameters which can be used to modify its default behavior.
+
 ### MIME Type
 
 The MIME type to indicate in the response when rendering the export template (optional). Defaults to `text/plain`.
@@ -28,8 +34,6 @@ The MIME type to indicate in the response when rendering the export template (op
 
 The file name to give to the rendered export file (optional).
 
-!!! info "This field was introduced in NetBox v4.3."
-
 ### File Extension
 
 The file extension to append to the file name in the response (optional).