786 rm extra env vars

[asmacdo]

What does this PR do?

Fixes #786

Prevents extra environment variables from being listed in the helptext when default_env=True

• version actions
• subcommands (ie PREFIX_<subcommand>)

Example:

Example code

from jsonargparse import ArgumentParser

parser = ArgumentParser(
    prog='cli',
    description='Minimal CLI example',
    default_env=True,
)
parser.add_argument('--version', action='version', version='1.0.0')

subcommands = parser.add_subcommands()
subparser = ArgumentParser()
subcommands.add_subcommand('greet', subparser, help='Greet someone')

parser.print_help()

Fixed output

python example_issue_786.py 
usage: cli [-h] [--version] {greet} ...

Minimal CLI example

options:
  ARG:   -h, --help     Show this help message and exit.
  ARG:   --version      show program's version number and exit

subcommands:
  For more details of each subcommand, add it as an argument followed by --help.

  ENV:   CLI_SUBCOMMAND

  Available subcommands:
    greet               Greet someone

Original output

python example_issue_786.py
usage: cli [-h] [--version] {greet} ...

Minimal CLI example

options:
  ARG:   -h, --help     Show this help message and exit.
  ARG:   --version
  ENV:   CLI_VERSION
                        show program's version number and exit

subcommands:
  For more details of each subcommand, add it as an argument followed by --help.

  ENV:   CLI_SUBCOMMAND

  Available subcommands:
    ARG:   greet
  ENV:   CLI_GREET
                        Greet someone

Before submitting

• Did you read the contributing guideline?
  - [ ] Did you update the documentation? (readme and public docstrings)
  IMO does not need, but lmk if theres something
• Did you write unit tests such that there is 100% coverage on related code? (required for bug fixes and new features)
• Did you verify that new and existing tests pass locally?
• Did you make sure that all changes preserve backward compatibility?
• Did you update the CHANGELOG including a pull request link? (not for typos, docs, test updates, or minor internal changes/refactors)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (36679f3) to head (d75ea61).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #787   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         7060      7062    +2     
=========================================
+ Hits          7060      7062    +2     

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[mauvilsa]

Perfect!