feat: enable soft delete for organizations (#16584)

- Add deleted column to organizations table
- Add trigger to check for existing workspaces, templates, groups and
members in a org before allowing the soft delete

---------

Co-authored-by: Steven Masley <stevenmasley@gmail.com>
Co-authored-by: Steven Masley <Emyrk@users.noreply.github.com>

coderd/database/models.go

@@ -2675,6 +2675,7 @@ type Organization struct {
 	IsDefault   bool      `db:"is_default" json:"is_default"`
 	DisplayName string    `db:"display_name" json:"display_name"`
 	Icon        string    `db:"icon" json:"icon"`
+	Deleted     bool      `db:"deleted" json:"deleted"`
 }
 
 type OrganizationMember struct {