fix(anta): Remove JSON output when saving to a file

[carl-baillargeon]

Description

When using the CLI command anta nrfu json --output ./results.json, results will be saved in a JSON file without printing to the console.

Fixes #760

Checklist:

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

[carl-baillargeon]

LGTM - maybe need to mark the PR as a breaking change?

Not sure.. The basic usage without --output remains unchanged and the new bahavior is more consistent with common CLI patterns (where specifying an output file often implies redirecting output away from stdout) so it could be considered as a fix/bug.

[sonarcloud[bot]]

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

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