[ci] remove hash -r, its taking 2 minutes and maybe unnecessary (#3…

…2616)

Noticed that this step takes like 2 minutes on CI, and I'm pretty sure I only added it without knowing it was necessary, so trying out removing it.

src/dev/ci_setup/setup.sh

@@ -84,7 +84,6 @@ fi
 ### "install" node into this shell
 ###
 export PATH="$nodeBin:$PATH"
-hash -r
 
 ###
 ### downloading yarn
@@ -102,7 +101,6 @@ yarn config set yarn-offline-mirror "$cacheDir/yarn-offline-cache"
 ###
 yarnGlobalDir="$(yarn global bin)"
 export PATH="$PATH:$yarnGlobalDir"
-hash -r
 
 ###
 ### use the chromedriver cache if it exists