chore: add form_type parameter argument to db (#17920)

`form_type` is a new parameter field in the terraform provider. Bring
that field into coder/coder.

Validation for `multi-select` has also been added.

coderd/apidoc/docs.go

@@ -16095,6 +16095,23 @@ const docTemplate = `{
                 "ephemeral": {
                     "type": "boolean"
                 },
+                "form_type": {
+                    "description": "FormType has an enum value of empty string, ` + "`" + `\"\"` + "`" + `.\nKeep the leading comma in the enums struct tag.",
+                    "type": "string",
+                    "enum": [
+                        "",
+                        "radio",
+                        "dropdown",
+                        "input",
+                        "textarea",
+                        "slider",
+                        "checkbox",
+                        "switch",
+                        "tag-select",
+                        "multi-select",
+                        "error"
+                    ]
+                },
                 "icon": {
                     "type": "string"
                 },

coderd/apidoc/swagger.json

@@ -14662,6 +14662,23 @@
 				"ephemeral": {
 					"type": "boolean"
 				},
+				"form_type": {
+					"description": "FormType has an enum value of empty string, `\"\"`.\nKeep the leading comma in the enums struct tag.",
+					"type": "string",
+					"enum": [
+						"",
+						"radio",
+						"dropdown",
+						"input",
+						"textarea",
+						"slider",
+						"checkbox",
+						"switch",
+						"tag-select",
+						"multi-select",
+						"error"
+					]
+				},
 				"icon": {
 					"type": "string"
 				},