fix: prevent yarn directory traversal on plugin installation #6829
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fixes #4041 (and possibly others)
Yarn would previously traverse up the directory tree looking for a workspace
package.json.This PR prevents this behavior by writing a dummy
package.jsonso yarn stops looking.Solves errors that occur when a
package.jsonexists in a parent directory (such as the user home directory or the root directory). Even when those errors don't occur, this may speed up execution very slightly by making fewer disk calls.