chore: use rules_shell (#2305)

Summary:
- move bazelversion sh_test to //tests
- add rules_shell dev dependency
- use sh_test for the sh_py_run_test
- use rules_shell in examples/bzlmod
- use rules_shell in multi_python_versions example

Fixes #2299.

examples/multi_python_versions/WORKSPACE

diff --git a/examples/multi_python_versions/WORKSPACE b/examples/multi_python_versions/WORKSPACE
index 4f731d9..48d2065 100644
--- a/examples/multi_python_versions/WORKSPACE
+++ b/examples/multi_python_versions/WORKSPACE
@@ -45,3 +45,19 @@
 load("@pypi//:requirements.bzl", "install_deps")
 
 install_deps()
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# See https://github.com/bazelbuild/rules_shell/releases/tag/v0.2.0
+http_archive(
+    name = "rules_shell",
+    sha256 = "410e8ff32e018b9efd2743507e7595c26e2628567c42224411ff533b57d27c28",
+    strip_prefix = "rules_shell-0.2.0",
+    url = "https://github.com/bazelbuild/rules_shell/releases/download/v0.2.0/rules_shell-v0.2.0.tar.gz",
+)
+
+load("@rules_shell//shell:repositories.bzl", "rules_shell_dependencies", "rules_shell_toolchains")
+
+rules_shell_dependencies()
+
+rules_shell_toolchains()