chore(deps): Updated to Theia 1.39.0 (#2144)

- update Theia to `1.39.0`,
 - remove the application packager and fix the security vulnerabilities,
 - bundle the backed application with `webpack`, and
 - enhance the developer docs.

Co-authored-by: Akos Kitta <a.kitta@arduino.cc>
Co-authored-by: per1234 <accounts@perglass.com>

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/node/exec-util.ts

@@ -1,18 +1,4 @@
 import { spawn } from 'node:child_process';
-import os from 'node:os';
-import { join } from 'node:path';
-
-export type ArduinoBinaryName =
-  | 'arduino-cli'
-  | 'arduino-fwuploader'
-  | 'arduino-language-server';
-export type ClangBinaryName = 'clangd' | 'clang-format';
-export type BinaryName = ArduinoBinaryName | ClangBinaryName;
-
-export function getExecPath(binaryName: BinaryName): string {
-  const filename = `${binaryName}${os.platform() === 'win32' ? '.exe' : ''}`;
-  return join(__dirname, '..', '..', 'build', filename);
-}
 
 export function spawnCommand(
   command: string,