fix: add vite-plus/pack/client export as tsdown/client equivalent #5406

Job	Run time
detect-changes	4s
download-previous-rolldown-binaries	10s
Build vite-plus packages (windows-latest)	15m 11s
Build vite-plus packages (ubuntu-latest)	7m 42s
Notify on failure	1s
${{ matrix.project.name }} E2E test (${{ matrix.os }})	1s
	23m 9s

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