Remove unused devDependencies

Removes unused devDependencies from extensions/ql-vscode/package.json:
- @babel/preset-react
- @babel/preset-typescript
- @types/styled-components
- @typescript-eslint/eslint-plugin
- cosmiconfig
- eslint-plugin-etc

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: josefs