Test entry points with editable install (#84002)

This allows collection of code coverage for the entry points.

test/integration/targets/entry_points/runme.sh

@@ -1,30 +1,45 @@
 #!/usr/bin/env bash
 
 set -eu -o pipefail
+
+function check_entry_points() {
+    bin_dir="$(dirname "$(command -v pip)")"
+
+    for bin in "${bin_dir}/ansible"*; do
+        name="$(basename "${bin}")"
+
+        entry_point="${name//ansible-/}"
+        entry_point="${entry_point//ansible/adhoc}"
+
+        echo "=== ${name} (${entry_point})=${bin} ==="
+
+        if [ "${name}" == "ansible-test" ]; then
+            "${bin}" --help | tee /dev/stderr | grep -Eo "^usage:\ ansible-test\ .*"
+            python.py -m ansible "${entry_point}" --help | tee /dev/stderr | grep -Eo "^usage:\ ansible-test\ .*"
+        else
+            "${bin}" --version | tee /dev/stderr | grep -Eo "(^${name}\ \[core\ .*|executable location = ${bin}$)"
+            python.py -m ansible "${entry_point}" --version | tee /dev/stderr | grep -Eo "(^${name}\ \[core\ .*|executable location = ${bin}$)"
+        fi
+    done
+}
+
 source virtualenv.sh
 set +x
-unset PYTHONPATH
+unset PYTHONPATH  # this causes the test to fail if it was started from an existing virtual environment
 
 base_dir="$(dirname "$(dirname "$(dirname "$(dirname "${OUTPUT_DIR}")")")")"
-bin_dir="$(dirname "$(command -v pip)")"
 
 # deps are already installed, using --no-deps to avoid re-installing them
-pip install "${base_dir}" --disable-pip-version-check --no-deps
-# --use-feature=in-tree-build not available on all platforms
+pip_options=(--disable-pip-version-check --no-deps)
 
-for bin in "${bin_dir}/ansible"*; do
-    name="$(basename "${bin}")"
+echo "==> check entry points using an editable install"
 
-    entry_point="${name//ansible-/}"
-    entry_point="${entry_point//ansible/adhoc}"
+pip install -e "${base_dir}" "${pip_options[@]}"
+check_entry_points
+pip uninstall -y ansible-core
 
-    echo "=== ${name} (${entry_point})=${bin} ==="
+echo "==> check entry points using a normal install"
 
-    if [ "${name}" == "ansible-test" ]; then
-        "${bin}" --help | tee /dev/stderr | grep -Eo "^usage:\ ansible-test\ .*"
-        python -m ansible "${entry_point}" --help | tee /dev/stderr | grep -Eo "^usage:\ ansible-test\ .*"
-    else
-        "${bin}" --version | tee /dev/stderr | grep -Eo "(^${name}\ \[core\ .*|executable location = ${bin}$)"
-        python -m ansible "${entry_point}" --version | tee /dev/stderr | grep -Eo "(^${name}\ \[core\ .*|executable location = ${bin}$)"
-    fi
-done
+pip install "${base_dir}" "${pip_options[@]}"
+check_entry_points
+pip uninstall -y ansible-core