pants export with a pantsd that's already run export gives "plugin is calling await Effect(...)" warning, in Pants 2.22

[huonw]

Describe the bug

If one runs pants export to create a Python venv twice with the same Pantsd process, one gets two identical warnings:

14:35:32.11 [WARN] A plugin is calling `await Effect(InteractiveProcessResult, InteractiveProcess, process)` directly. This will cause restarting logic not to be applied. Use `await run_interactive_process(process)` or `await run_interactive_process_in_environment(process, environment_name)` instead. See https://github.com/pantsbuild/pants/blob/release_2.22.0/src/python/pants/engine/intrinsics.py for more details.

Reproducer:

cd $(mktemp -d)

cat > pants.toml <<EOF
[GLOBAL]
pants_version = "2.22.0"

backend_packages = [
  "pants.backend.python",
]

[python]
interpreter_constraints = ["CPython==3.10.*"]
enable_resolves = true
EOF

pants generate-lockfiles --resolve=python-default

echo "*** First export ***"
# Okay, no warnings
pants export --resolve=python-default

echo "*** Second export ***"
# BUG: two warnings
pants export --resolve=python-default

Trimmed output:

...
*** First export ***
Wrote mutable virtualenv for python-default (using Python 3.10.12) to dist/export/python/virtualenvs/python-default/3.10.12

*** Second export ***
14:43:43.80 [WARN] A plugin is calling `await Effect(InteractiveProcessResult, InteractiveProcess, process)` directly. This will cause restarting logic not to be applied. Use `await run_interactive_process(process)` or `await run_interactive_process_in_environment(process, environment_name)` instead. See https://github.com/pantsbuild/pants/blob/release_2.22.0/src/python/pants/engine/intrinsics.py for more details.
14:43:47.29 [WARN] A plugin is calling `await Effect(InteractiveProcessResult, InteractiveProcess, process)` directly. This will cause restarting logic not to be applied. Use `await run_interactive_process(process)` or `await run_interactive_process_in_environment(process, environment_name)` instead. See https://github.com/pantsbuild/pants/blob/release_2.22.0/src/python/pants/engine/intrinsics.py for more details.
Wrote mutable virtualenv for python-default (using Python 3.10.12) to dist/export/python/virtualenvs/python-default/3.10.12

Pants version
2.22.0

OS
macOS

Additional info
The warning comes from #21319 / #21303.