fix: use correct ami percentage in csv (#4520)

[ludtkemorgan]

This PR addresses bloom-housing#1027

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

The listing units csv export is displaying the incorrect AMI Chart percentage. It is grabbing the first value from the amiChart instead of getting the percentage off of the unit table

Note:

• There are currently no tests that cover the CSV export. I have added a test as part of this change, but only test the unit CSV. More tests should be added

How Can This Be Tested/Reviewed?

After a clean reseed In the partner site click the "Export to CSV" button on the listings page and compare the values to the listings

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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[mcgarrye]

lgtm