Remove snapcraft clean (#9585)

* Revert " add snapcraft package image (master) (#9584)"

This reverts commit ceaedbb.

* Update package-snap.sh

* Update .gitlab-ci.yml

Author: General-Beck

scripts/gitlab/package-snap.sh

@@ -11,7 +11,6 @@ esac
 SNAP_PACKAGE="parity_"$VERSION"_"$BUILD_ARCH".snap"
 echo "__________Create snap package__________"
 echo "Release channel :" $GRADE " Branch/tag: " $CI_COMMIT_REF_NAME
-snapcraft clean
 echo $VERSION:$GRADE:$BUILD_ARCH
 cat scripts/gitlab/templates/snapcraft.template.yaml | envsubst '$VERSION:$GRADE:$BUILD_ARCH:$CARGO_TARGET' > snapcraft.yaml
 cat snapcraft.yaml