[gha] Increase timeout to load extension on windows (#3598)

### Changes

Set NNCF_EXTENSION_LOAD_TIMEOUT variable 

### Reason for changes


https://github.com/openvinotoolkit/nncf/actions/runs/16394113956/job/46323939713

### Tests


https://github.com/openvinotoolkit/nncf/actions/runs/16568731802/job/46855106869?pr=3598

Author: AlexanderDokuchaev

.github/workflows/examples.yml

@@ -20,7 +20,6 @@ on:
         type: boolean
         default: false
 
-
 concurrency:
   group: test-examples-${{ github.workflow }}-${{ github.ref }}-${{ github.event.inputs.pytest_args || '' }}-${{github.event.inputs.pull_request_number || ''}}
   cancel-in-progress: false
@@ -197,6 +196,7 @@ jobs:
           [ $ret -eq 5 ] && [ -n "${{ github.event.inputs.pytest_args || '' }}" ]  && exit 0 || exit $ret
         env:
           TQDM_DISABLE: 1
+          NNCF_EXTENSION_LOAD_TIMEOUT: 180
       - name: Test Summary
         if: ${{ !cancelled() }}
         run: |