chore: tsdown dual build #6638

Job	Run time
Format check	37s
Linter	1m 31s
Integration tests (macos-latest)	44s
Unit tests (macos-latest)	1m 0s
Unit tests (windows-latest)	1m 52s
Unit tests (ubuntu-latest)	38s
E2E tests (ubuntu-latest)	5m 59s
E2E tests (windows-latest)	3m 19s
E2E tests (macos-latest)	7m 23s
Build	1m 28s
Integration tests (ubuntu-latest)	39s
Integration tests (windows-latest)	1m 55s
	27m 5s

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