Playwright docker improvements (#33213)

* Clean up playwright-common Dockerfile

* Speed up element-web docker build

* Wire up element-desktop playwright tests via nx

* Better debug logs for Element Desktop playwright in CI

* Iterate

* Iterate

* Fix element-desktop screenshot docker

* @electron/fuses

* Partial revert

.github/workflows/build_desktop_test.yaml

@@ -97,6 +97,7 @@ jobs:
                   PW_TAG: ${{ inputs.project }}
                   ELEMENT_DESKTOP_EXECUTABLE: ${{ steps.executable.outputs.path }}
                   ARGS: ${{ inputs.args }}
+                  DEBUG: pw:browser
 
             - name: Upload blob report
               if: always() && inputs.blob_report