Detect non GNU getopt and error early

[Jacobfaib]

Description

Detect non "enhanced" getopt early in .devcontainer/launch.sh (for example, BSD getopt) and give a more informative error message. BSD getopt for instance does not support long options and will silently skip them leading to strange errors later down the line

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[Jacobfaib]

Maybe a better approach would be to use the standard getopt builtin, but this requires manually parsing long options and doesn't support fancy options like --option=value (note the =)

[bernhardmgruber]

/ok to test 6670625

[github-actions]

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