Backport !6635 (limanet built-in-alias) to v15-release

Context

#3680 (closed)

Backport of !6635 (merged) to v15-release.

Manually testing the MR

./octez-node config init -d ~/octez-limanet --network limanet
./octez-node run -d ~/octez-limanet

Checklist

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