chore: tsdown dual build #6636

Job	Run time
Format check	38s
Unit tests (macos-latest)	59s
Unit tests (ubuntu-latest)	42s
Unit tests (windows-latest)	1m 52s
E2E tests (ubuntu-latest)	2m 41s
Integration tests (macos-latest)	49s
Build	1m 20s
Integration tests (windows-latest)	1m 50s
Integration tests (ubuntu-latest)	1m 27s
E2E tests (windows-latest)	3m 16s
E2E tests (macos-latest)	3m 20s
Linter	1m 30s
	20m 24s

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