chore: add 'classic_parameter_flow' column setting to templates (#17828)

We are forcing users to try the dynamic parameter experience first.
Currently this setting only comes into effect if an experiment is
enabled.

coderd/database/migrations/000327_version_dynamic_parameter_flow.down.sql

@@ -0,0 +1,28 @@
+DROP VIEW template_with_names;
+
+-- Drop the column
+ALTER TABLE templates DROP COLUMN use_classic_parameter_flow;
+
+
+CREATE VIEW
+	template_with_names
+AS
+SELECT
+	templates.*,
+	coalesce(visible_users.avatar_url, '') AS created_by_avatar_url,
+	coalesce(visible_users.username, '') AS created_by_username,
+	coalesce(organizations.name, '') AS organization_name,
+	coalesce(organizations.display_name, '') AS organization_display_name,
+	coalesce(organizations.icon, '') AS organization_icon
+FROM
+	templates
+		LEFT JOIN
+	visible_users
+	ON
+		templates.created_by = visible_users.id
+		LEFT JOIN
+	organizations
+	ON templates.organization_id = organizations.id
+;
+
+COMMENT ON VIEW template_with_names IS 'Joins in the display name information such as username, avatar, and organization name.';