[moblab] Improve the gitignore

BUG=None
TEST=None

Change-Id: I23f2d55d621fca7c13c828f5981ab002ca67f777
Reviewed-on: https://chromium-review.googlesource.com/1532529
Commit-Ready: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Matt Mallett <mattmallett@chromium.org>
diff --git a/.gitignore b/.gitignore
index ea50b19..ccd35f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,8 @@
 
 /.cache/
 /.coverage
-/node_modules
+*node_modules
+*_pb2*py
+*.idea/
+*pb*.ts
+*pb*.js