build: delete unneeded files when running a release (#21216)

* build: delete unneeded files when running a release

Needed to free up disk space on MacOS.

* Delete all the .git directories

* Update comment

* Run gn gen after deleting .git dirs

.circleci/config.yml

@@ -256,10 +256,11 @@ step-get-more-space-on-mac: &step-get-more-space-on-mac
 
 step-delete-git-directories: &step-delete-git-directories
   run:
-    name: Delete src/.git directory on MacOS to free space
+    name: Delete all .git directories under src on MacOS to free space
     command: |
       if [ "`uname`" == "Darwin" ]; then
-        sudo rm -rf src/.git
+        cd src
+        ( find . -type d -name ".git" ) | xargs rm -rf
       fi
 
 # On macOS the yarn install command during gclient sync was run on a linux
@@ -907,8 +908,8 @@ steps-electron-build: &steps-electron-build
     - *step-get-more-space-on-mac
     - *step-install-npm-deps-on-mac
     - *step-fix-sync-on-mac
-    - *step-gn-gen-default
     - *step-delete-git-directories
+    - *step-gn-gen-default
 
     # Electron app
     - *step-electron-build
@@ -989,8 +990,8 @@ steps-electron-build-with-inline-checkout-for-tests: &steps-electron-build-with-
     - *step-get-more-space-on-mac
     - *step-install-npm-deps-on-mac
     - *step-fix-sync-on-mac
-    - *step-gn-gen-default
     - *step-delete-git-directories
+    - *step-gn-gen-default
 
     # Electron app
     - *step-electron-build
@@ -1085,8 +1086,9 @@ steps-electron-build-for-publish: &steps-electron-build-for-publish
     - *step-get-more-space-on-mac
     - *step-gclient-sync
     - *step-setup-env-for-build
-    - *step-gn-gen-default
     - *step-delete-git-directories
+    - *step-minimize-workspace-size-from-checkout
+    - *step-gn-gen-default
 
     # Electron app
     - *step-electron-build