fix: Use shortname for project export (DEV-3430)

[siers]

Pull Request Checklist

Task Description/Number

Issue Number: DEV-

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)
• deprecated: Deprecation warning (ideally referencing a migration guide)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes

Does this PR change client-test-data?

• Yes

[linear]

DEV-3430 incorrect response for some project export routes

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 13.49%. Comparing base (e666752) to head (e72d462).

Files	Patch %	Lines
.../slice/admin/api/model/ProjectExportResponse.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3169       +/-   ##
===========================================
- Coverage   88.78%   13.49%   -75.30%     
===========================================
  Files         269      269               
  Lines       22334    22334               
===========================================
- Hits        19830     3014    -16816     
- Misses       2504    19320    +16816     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.