Move cost_estimation and ecological_assessment to assessment repo

Description

cost_estimation and ecological_assessment are moved to the assessment repo and therefore deleted here.

Related Issue(s)

Related to unicado-package#59

Other Changes

Update CODEOWNERS

Screenshots/Logs

NA

Testing Instructions

Test with unicado-package!31

Developer Checklist

• Code has been tested locally and/or in pipeline.
• (if applicable) documentation updated.
• (if applicable) impact of new dependencies reviewed and included in project.
• Merge conflicts resolved with the target branch.

Additional Notes

We should discuss whether performance assessment is also moved to this repo (flight performance will also be there)