Eachdist expects that that python interpreter is always named 'python'

[pilhuhn]

Describe your environment

UPDATE:
I guess my issues come from the fact that CONTRIBUTING.md only quickly says "First create a virtualenv and activate it. Then run python scripts/eachdist.py develop" , which is easily overlooked. Also it does not really say in which way to create the v-env (this is hidden in README). But even this combo does not work

❯ python3 -m venv my_test_env
❯ python3 scripts/eachdist.py develop
>>> python -m pip install --upgrade pip setuptools wheel --upgrade-strategy=eager
Traceback (most recent call last):
...  [ same as below ] ...

Both on macOS and RHEL

❯ python3.10 scripts/eachdist.py develop
>>> python -m pip install --upgrade pip setuptools wheel --upgrade-strategy=eager
Traceback (most recent call last):
  File "/Users/hrupp/src/opentelemetry-python-contrib/scripts/eachdist.py", line 389, in runsubprocess
    return subprocess_run(params, *args, check=check, **kwargs)
  File "/usr/local/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/subprocess.py", line 501, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/local/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/subprocess.py", line 969, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/local/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/subprocess.py", line 1845, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'python'

This is even despite the shebang goes #!/usr/bin/env python3:

❯ python3 scripts/eachdist.py develop
>>> python -m pip install --upgrade pip setuptools wheel --upgrade-strategy=eager
Traceback (most recent call last):
  File "/Users/hrupp/src/opentelemetry-python-contrib/scripts/eachdist.py", line 389, in runsubprocess
    return subprocess_run(params, *args, check=check, **kwargs)
  File "/usr/local/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/subprocess.py", line 501, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/local/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/subprocess.py", line 969, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/local/Cellar/python@3.10/3.10.7/Frameworks/Python.framework/Versions/3.10/lib/python3.10/subprocess.py", line 1845, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'python'

Steps to reproduce

See above

What is the expected behavior?

The script should determine the used python version and then use that interpreter name to continue instead of only 'python'