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/executable-service-impl.ts

@@ -1,7 +1,11 @@
 import { FileUri } from '@theia/core/lib/node/file-uri';
 import { injectable } from '@theia/core/shared/inversify';
 import { ExecutableService } from '../common/protocol/executable-service';
-import { getExecPath } from './exec-util';
+import {
+  arduinoCliPath,
+  arduinoLanguageServerPath,
+  clangdPath,
+} from './resources';
 
 @injectable()
 export class ExecutableServiceImpl implements ExecutableService {
@@ -11,9 +15,9 @@ export class ExecutableServiceImpl implements ExecutableService {
     lsUri: string;
   }> {
     return {
-      clangdUri: FileUri.create(getExecPath('clangd')).toString(),
-      cliUri: FileUri.create(getExecPath('arduino-cli')).toString(),
-      lsUri: FileUri.create(getExecPath('arduino-language-server')).toString(),
+      clangdUri: FileUri.create(clangdPath).toString(),
+      cliUri: FileUri.create(arduinoCliPath).toString(),
+      lsUri: FileUri.create(arduinoLanguageServerPath).toString(),
     };
   }
 }