ci: upgrade Node.js version from 18 to 22

Update CI workflows to use Node.js 22 to match local development
environment. This provides:
- Better compatibility with modern dependencies
- Native support for newer JavaScript features
- No need for webidl-conversions polyfills
- Consistent behavior between local and CI environments

Author: chiptus

.github/workflows/e2e-tests.yml

@@ -24,7 +24,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 22
           cache: "pnpm"
 
       - name: Install dependencies
@@ -65,7 +65,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 22
           cache: "pnpm"
 
       - name: Install dependencies

.github/workflows/unit-tests.yml

@@ -19,7 +19,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 22
           cache: "pnpm"
 
       - name: Install dependencies