Closes #14740: Remove BootstrapMixin (#14841)

* Introduce custom form widget templates to apply CSS classes

* Apply both mandatory and optional CSS classes to form widgets

* Omit required & placeholder attrs

* Move annotation of field validation failures to CSS

* Remove BootstrapMixin class

* Remove obsolete ComponentTemplateImportForm class

* Remove obsolete custom forms for login & password change

* Clean up obsolete accommodations for 'required' widget attr

netbox/extras/dashboard/forms.py

@@ -4,7 +4,7 @@ from django.utils.translation import gettext as _
 
 from extras.choices import DashboardWidgetColorChoices
 from netbox.registry import registry
-from utilities.forms import BootstrapMixin, add_blank_choice
+from utilities.forms import add_blank_choice
 
 __all__ = (
     'DashboardWidgetAddForm',
@@ -16,7 +16,7 @@ def get_widget_choices():
     return registry['widgets'].items()
 
 
-class DashboardWidgetForm(BootstrapMixin, forms.Form):
+class DashboardWidgetForm(forms.Form):
     title = forms.CharField(
         required=False
     )

netbox/extras/dashboard/widgets.py

@@ -15,7 +15,6 @@ from django.utils.translation import gettext as _
 from core.models import ContentType
 from extras.choices import BookmarkOrderingChoices
 from utilities.choices import ButtonColorChoices
-from utilities.forms import BootstrapMixin
 from utilities.permissions import get_permission_for_model
 from utilities.templatetags.builtins.filters import render_markdown
 from utilities.utils import content_type_identifier, content_type_name, dict_to_querydict, get_viewname
@@ -58,7 +57,7 @@ def get_models_from_content_types(content_types):
     return models
 
 
-class WidgetConfigForm(BootstrapMixin, forms.Form):
+class WidgetConfigForm(forms.Form):
     pass