docs: document registry bridge preview builds and vp migrate upgrades #10901

Job	Run time
optimize-ci	2s
detect-changes	4s
Lint	0s
done	3s
Test (Linux x64 musl)	-1s
Test	-1s
download-previous-rolldown-binaries	-1s
Local CLI `vp install` E2E test (Socket Firewall Free)	-1s
CLI E2E test (Linux x64 musl)	-1s
Local CLI `vp install` E2E test	-1s
CLI E2E test	-1s
CLI snap test (${{ matrix.target }}, ${{ matrix.shard }}/${{ matrix.shardTotal }})	-1s
	1s

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