sign.sh: cleanup files from previous sign attempt
sign.sh: cleanup files from previous sign attempt

(cherry picked from commit 9d064768147939d5209ee1141dbbc2809192ad8c)

GitOrigin-RevId: 79d1281dc7cedfa203ec4808f0a3e61a265bcce1

allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community