A RuleRunner subclass to set ICs in Python-related tests. (#18709)

Subsequent PRs will apply this in relevant tests, so we can remove
one of the hacks introduced in #18627.

I have applied this to several tests and verified that it works.

src/python/pants/testutil/python_rule_runner.py

@@ -0,0 +1,26 @@
+# Copyright 2023 Pants project contributors (see CONTRIBUTORS.md).
+# Licensed under the Apache License, Version 2.0 (see LICENSE).
+
+from __future__ import annotations
+
+from typing import Iterable, Mapping
+
+from pants.option.options_bootstrapper import OptionsBootstrapper
+from pants.testutil.rule_runner import RuleRunner
+
+
+class PythonRuleRunner(RuleRunner):
+    """Set common python rule-specific options."""
+
+    def create_options_bootstrapper(
+        self, args: Iterable[str], env: Mapping[str, str] | None
+    ) -> OptionsBootstrapper:
+        env = dict(env) if env else {}
+        if (
+            not any("--python-interpreter-constraints=" in arg for arg in args)
+            and "PANTS_PYTHON_INTERPRETER_CONSTRAINTS" not in env
+        ):
+            # We inject the test ICs via env and not args, because in a handful of cases
+            # we have different behavior when the option is set via flag.
+            env["PANTS_PYTHON_INTERPRETER_CONSTRAINTS"] = "['>=3.7,<3.10',]"
+        return super().create_options_bootstrapper(args=args, env=env)

src/python/pants/testutil/rule_runner.py

@@ -316,7 +316,7 @@ def rewrite_rule_for_inherent_environment(rule):
         self.build_config = build_config_builder.create()
 
         self.environment = CompleteEnvironmentVars({})
-        self.options_bootstrapper = create_options_bootstrapper(args=bootstrap_args)
+        self.options_bootstrapper = self.create_options_bootstrapper(args=bootstrap_args, env=None)
         self.extra_session_values = extra_session_values or {}
         self.inherent_environment = inherent_environment
         self.max_workunit_verbosity = max_workunit_verbosity
@@ -442,6 +442,11 @@ def run_goal_rule(
         console.flush()
         return GoalRuleResult(exit_code, stdout.getvalue(), stderr.getvalue())
 
+    def create_options_bootstrapper(
+        self, args: Iterable[str], env: Mapping[str, str] | None
+    ) -> OptionsBootstrapper:
+        return create_options_bootstrapper(args=args, env=env)
+
     def set_options(
         self,
         args: Iterable[str],
@@ -465,7 +470,7 @@ def set_options(
             **{k: os.environ[k] for k in (env_inherit or set()) if k in os.environ},
             **(env or {}),
         }
-        self.options_bootstrapper = create_options_bootstrapper(args=args, env=env)
+        self.options_bootstrapper = self.create_options_bootstrapper(args=args, env=env)
         self.environment = CompleteEnvironmentVars(env)
         self._set_new_session(self.scheduler.scheduler)