add test for multiple requirement input files

Author: cj81499

tests/multiple_requirements_in/BUILD.bazel

@@ -0,0 +1,14 @@
+load("@rules_python//python:pip.bzl", "compile_pip_requirements")
+
+compile_pip_requirements(
+    name = "requirements",
+    extra_args = [
+        "--allow-unsafe",
+        "--resolver=backtracking",
+    ],
+    requirements_in = [
+        "requirements_1.in",
+        "requirements_2.in",
+    ],
+    requirements_txt = "requirements.txt",
+)

tests/multiple_requirements_in/README.md

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+# ignore_root_user_errors
+There are cases when we have to run Python targets with root, e.g., in Docker containers, requiring setting `ignore_root_user_error = True` when registering Python toolchain. This test makes sure that rules_python works in this case.

tests/multiple_requirements_in/WORKSPACE

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+workspace(name = "multiple_requirements_in")
+
+local_repository(
+    name = "rules_python",
+    path = "../..",
+)
+
+load("@rules_python//python:repositories.bzl", "py_repositories", "python_register_toolchains")
+
+py_repositories()
+
+load("@rules_python//python/pip_install:repositories.bzl", "pip_install_dependencies")
+
+pip_install_dependencies()
+
+python_register_toolchains(
+    name = "python39",
+    python_version = "3.9",
+)

tests/multiple_requirements_in/requirements.txt

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+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    bazel run //tests/multiple_requirements_in:requirements.update
+#
+attrs==22.2.0 \
+    --hash=sha256:29e95c7f6778868dbd49170f98f8818f78f3dc5e0e37c0b1f474e3561b240836 \
+    --hash=sha256:c9227bfc2f01993c03f68db37d1d15c9690188323c067c641f1a35ca58185f99
+    # via -r tests/multiple_requirements_in/requirements_2.in
+urllib3==1.26.14 \
+    --hash=sha256:076907bf8fd355cde77728471316625a4d2f7e713c125f51953bb5b3eecf4f72 \
+    --hash=sha256:75edcdc2f7d85b137124a6c3c9fc3933cdeaa12ecb9a6a959f22797a0feca7e1
+    # via -r tests/multiple_requirements_in/requirements_1.in

tests/multiple_requirements_in/requirements_1.in

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+urllib3 ~= 1.26

tests/multiple_requirements_in/requirements_2.in

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+attrs ~= 22.2