fix(test): force install npm in e2e-behaviour (facebook#8402)

This will fix e2e-behaviour on macos

Related: npm/cli#611 (comment)

Author: Andrew Luca

tasks/e2e-behavior.sh

@@ -63,7 +63,7 @@ root_path=$PWD
 
 if hash npm 2>/dev/null
 then
-  npm i -g npm@latest
+  npm i -g --force npm@latest
 fi
 
 # Bootstrap monorepo