fix(anta.cli): Disable env variable for --help and --version

[gmuloc]

Description

without this we get

ANTA_VERSION=42 anta get tags

Usage: anta [OPTIONS] COMMAND [ARGS]...
Try 'anta --help' for help.

Error: Invalid value for '--version': '42' is not a valid boolean.


ANTA_HELP=42 anta get tags
Usage: anta [OPTIONS] COMMAND [ARGS]...
Try 'anta --help' for help.

Error: Invalid value for '--help': '42' is not a valid boolean.

Fixes #868

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have run pre-commit for code linting and typing (pre-commit run)
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes (tox -e testenv)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codspeed-hq]

CodSpeed Performance Report

Merging #869 will not alter performance

_{Comparing gmuloc:remove-nasty-envvars (42538a8) with main (2541572)}

Summary

✅ 8 untouched benchmarks

[carl-baillargeon]

Tested locally!