Tweaks to CI (#33014)

* Tweak github actions to make Sonar & zizmor happier

* Apply filters on some pnpm install calls

* Remove stale setup-python step

* Add missing needs in complete job

* Remove repository_dispatch for everything bar develop CD

js-sdk now runs the tests downstream so this was unnecessary

* Fix prepare desktop for tests in merge queue

* Iterate

* Iterate

* Iterate

* Discard changes to .github/workflows/build_desktop_linux.yaml

* Discard changes to .github/workflows/build_desktop_macos.yaml

.github/workflows/build-and-test.yaml

@@ -18,8 +18,6 @@ on:
     push:
         # We do not build on push to develop as the merge_group check handles that
         branches: [staging, master]
-    repository_dispatch:
-        types: [element-web-notify]
 
     # support triggering from other workflows
     workflow_call:
@@ -246,6 +244,7 @@ jobs:
         needs:
             - playwright_ew
             - downstream-modules
+            - prepare_ed
             - build_ed_windows
             - build_ed_linux
             - build_ed_macos