chore(e2e): Ensure ldap is ready (#6736)

* fix(e2e): Modify ldap cleanup step

* chore(e2e): Parallelize dependency download

# Conflicts:
#	.github/workflows/enos-run.yml

* chore(e2e): Ensure ldap is ready

.github/workflows/enos-run.yml

@@ -263,7 +263,7 @@ jobs:
           # environment
           # A virtual environment was needed because python environments on
           # self-hosted runners are externally managed.
-          sudo apt install -y python3.12-venv
+          sudo apt install -y python3-venv
           python3 -m venv "$HOME/cqlsh-venv"
           "$HOME/cqlsh-venv/bin/pip" install --upgrade pip
           "$HOME/cqlsh-venv/bin/pip" install cqlsh