Use mamba env export differently: --no-build(s) and no --json

[mathbunnyru]

Describe your changes

This should work fine with both mamba v1 and v2

Issue ticket if applicable

Checklist (especially for first-time contributors)

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests
• I will try not to use force-push to make the review process easier for reviewers
• I have updated the documentation for significant changes