build: fixup windows source cache for release (#46236)

* build: fixup windows source cache for release

* build: fixup ffmpeg gn gen

* build: add build-tools depot_tools to PATH

There are some cases where it is still expected that depot_tools be in the path

* put back regular gn gen for ffmpeg

* build: add retry to moving source cache

This resolves the error: `Move-Item : The process cannot access the file because it is being used by another process.`

.github/workflows/windows-publish.yml

@@ -25,7 +25,8 @@ jobs:
       image: ghcr.io/electron/build:${{ inputs.build-image-sha }}
       options: --user root --device /dev/fuse --cap-add SYS_ADMIN
       volumes:
-        - /mnt/cross-instance-cache:/mnt/cross-instance-cache
+        - /mnt/win-cache:/mnt/win-cache
+        - /var/run/sas:/var/run/sas
     env:
       GCLIENT_EXTRA_ARGS: '--custom-var=checkout_win=True'
       TARGET_OS: 'win'