Fix clean.sh

tsc doesn't check if the output exists when incremental is true.

i.e if I delete the out directory, but keep the tsbuildinfo and
try to rebuild, nothing happens cause it thinks everything is
up to date I guess...

With this change, yarn clean will now remove the tsbuildinfo correctly
so things work as expected.

ci/build/clean.sh

@@ -5,16 +5,15 @@ main() {
   cd "$(dirname "${0}")/../.."
   source ./ci/lib.sh
 
-  rm -Rf \
+  rm -rf \
     out \
     release \
     release-standalone \
     release-packages \
     release-gcp \
-    release-images/ \
+    release-images \
     dist \
-    .tsbuildinfo \
+    .cache
-    .cache/out.tsbuildinfo
 
   pushd lib/vscode
   git clean -xffd