[ubuntu] split git and git-lfs into separate install scripts (#8711)

for better observability of integrity validation let us split install
script into two

images/linux/scripts/installers/git.sh

@@ -8,7 +8,6 @@
 source $HELPER_SCRIPTS/install.sh
 
 GIT_REPO="ppa:git-core/ppa"
-GIT_LFS_REPO="https://packagecloud.io/install/repositories/github/git-lfs"
 
 ## Install git
 add-apt-repository $GIT_REPO -y
@@ -21,20 +20,14 @@ cat <<EOF >> /etc/gitconfig
         directory = *
 EOF
 
-# Install git-lfs
-curl -fsSL $GIT_LFS_REPO/script.deb.sh | bash
-apt-get install -y git-lfs
-
 # Install git-ftp
 apt-get install git-ftp -y
 
 # Remove source repo's
 add-apt-repository --remove $GIT_REPO
-rm /etc/apt/sources.list.d/github_git-lfs.list
 
 # Document apt source repo's
 echo "git-core $GIT_REPO" >> $HELPER_SCRIPTS/apt-sources.txt
-echo "git-lfs $GIT_LFS_REPO" >> $HELPER_SCRIPTS/apt-sources.txt
 
 # Add well-known SSH host keys to known_hosts
 ssh-keyscan -t rsa,ecdsa,ed25519 github.com >> /etc/ssh/ssh_known_hosts