fix(variable export): provide clean JSON output on stdout

Daniel Sonckrequested to merge
gitlab-community/gitlab-org/cli:dsonck92/write-human-readable-to-stderr into main

Description

This MR fixes the issue where some human readable information is sent on stdout along with the chosen format, causing parsing by other tools to fail.

  • bug: don't pollute export output with human readable info

Separate the informational text to standard error instead of standard output so it can be processed by other tools.

Related Issues

Resolves #8076 (closed)

How has this been tested?

I have updated the unit tests related to this change to confirm the new Stdout/Stderr behavior. The old unit tests covered the prefix as well, so it seems it was intended behavior.

Edited by Daniel Sonck

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