Plumb accounts-db-skip-shrink through testnet scripts (backport #19290) (#19303)

* Plumb accounts-db-skip-shrink through testnet scripts (#19290)

(cherry picked from commit 1d375ff2da)

# Conflicts:
#	multinode-demo/bootstrap-validator.sh
#	multinode-demo/validator.sh
#	net/net.sh

* Fix conflicts

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

multinode-demo/bootstrap-validator.sh

@@ -75,6 +75,9 @@ while [[ -n $1 ]]; do
     elif [[ $1 == --maximum-snapshots-to-retain ]]; then
       args+=("$1" "$2")
       shift 2
+    elif [[ $1 == --accounts-db-skip-shrink ]]; then
+      args+=("$1")
+      shift
     else
       echo "Unknown argument: $1"
       $program --help