* Emit export errors to stderr to prevent invalid output

An error in export could emit error messages to stdout, causing the requirements.txt output to stdout to be invalid.

Fixes #4109

* Looks at stderr for export tests

fix (install-poetry): revert use of capture_output

Fix system environment detection

Fixed python_version for Python >= 3.10

Release 1.2.0a2

Improve package operations management

Bring back error solutions

Added pip style keyring password lookup as a fallback.

Fix system environment detection

fix: create path dependencies relative to package rather than lockfile (#4245)

* update shell command 

according to [SC2006](https://github.com/koalaman/shellcheck/wiki/SC2006):
> Backtick command substitution `...` is legacy syntax with several issues.

* merge updated table markdown

fixed broken link

Dependency groups

Properly detect if packages are a git installation over directory installation

Resolution speed improvement

Fix warning about  self update when using install-poetry.py

Relates-to: #2899

* handle poetry init non-interactive dependencies

1. in non-interactive mode, suppress "This command will guide you through..."
2. in interactive mode, respect command line --dependency if the user chooses NO for "Would you like to define your main dependencies interactively?"

Fix locked information for path, url and VCS dependencies