CI: remove no longer needed shippable scripts; modernize and harmonize AZP scripts (#1286)

* Remove no longer needed shippable scripts.

* Modernize and harmonize AZP scripts.

.azure-pipelines/scripts/aggregate-coverage.sh

@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
-# Aggregate code coverage results for later processing.
-
 # Copyright (c) Ansible Project
 # GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+# Aggregate code coverage results for later processing.
+
 set -o pipefail -eu
 
 agent_temp_directory="$1"
@@ -13,10 +13,6 @@ PATH="${PWD}/bin:${PATH}"
 
 mkdir "${agent_temp_directory}/coverage/"
 
-if [[ "$(ansible --version)" =~ \ 2\.9\. ]]; then
-    exit
-fi
-
 options=(--venv --venv-system-site-packages --color -v)
 
 ansible-test coverage combine --group-by command --export "${agent_temp_directory}/coverage/" "${options[@]}"