fix: add missing direct devDependencies to package.json

This is a prerequisite for CI to work with pnpm --frozen-lockfile.

Missing direct devDependencies that were only available transitively:
- eslint (lint script needs it)
- typescript (tsc script needs it)
- vite (provides vite/client.d.ts type definitions)
- vite-plugin-svgr (provides vite-plugin-svgr/client.d.ts type definitions)

Also fixed: tsconfig.json was missing skipLibCheck: true which caused
errors when type definitions referenced packages not in node_modules.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

tsconfig.json

@@ -2,6 +2,7 @@
   "extends": "@kinvolk/headlamp-plugin/config/plugins-tsconfig.json",
   "compilerOptions": {
     "jsx": "react",
+    "skipLibCheck": true,
     "types": ["vite/client", "vite-plugin-svgr/client", "vitest/globals", "@testing-library/jest-dom"]
   },
   "include": ["src"]