chore: remove export_count legacy alias from export state API #131

Job	Run time
pytest (windows-latest)	57s
API integration tests + coverage (windows-latest)	34s
Frontend unit tests (vitest) (windows-latest)	40s
Frontend unit tests (vitest) (ubuntu-latest)	14s
Verify prod requirements.txt is sufficient	9s
mypy	16s
API integration tests + coverage (ubuntu-latest)	16s
pytest (ubuntu-latest)	15s
	3m 21s

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