fix(version): disable legacy peer deps behavior by default (#4175)

Author: jaysoo

libs/core/src/lib/cli.ts

@@ -1,5 +1,9 @@
 // Plugin isolation is not relevant to lerna
 process.env["NX_ISOLATE_PLUGINS"] = "false";
+// If plugin isolation is off, also make sure we're not using the legacy peer deps behavior.
+// See: https://github.com/lerna/lerna/issues/4167
+// This could be removed if Nx is not setting this to true by default.
+process.env["npm_config_legacy_peer_deps"] ??= "false";
 
 import dedent from "dedent";
 import os from "node:os";