Change notification when extension is not found (#5184)

* Change notification when extension is not found

- Removes legacy downloadFile and downloadJson in favour of using
  `node-fetch`

- A notification will be displayed if the URL provided results in a
  status of 404

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Resolve PR comments

Signed-off-by: Sebastian Malton <sebastian@malton.name>

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/components/input/input.tsx

@@ -7,6 +7,7 @@ import "./input.scss";
 
 import type { DOMAttributes, InputHTMLAttributes, TextareaHTMLAttributes } from "react";
 import React from "react";
+import type { SingleOrMany } from "../../utils";
 import { autoBind, cssNames, debouncePromise, getRandId, isPromiseSettledFulfilled } from "../../utils";
 import { Icon } from "../icon";
 import type { TooltipProps } from "../tooltip";
@@ -72,7 +73,7 @@ export type InputProps = Omit<InputElementProps, "onChange" | "onSubmit"> & {
   iconLeft?: IconData;
   iconRight?: IconData;
   contentRight?: string | React.ReactNode; // Any component of string goes after iconRight
-  validators?: InputValidator<boolean> | InputValidator<boolean>[];
+  validators?: SingleOrMany<InputValidator>;
   blurOnEnter?: boolean;
   onChange?(value: string, evt: React.ChangeEvent<InputElement>): void;
   onSubmit?(value: string, evt: React.KeyboardEvent<InputElement>): void;