tools: remove stray package-lock.json file

Before the ESLint updates were automated, a stray package-lock.json file
was accidentally introduced in the tools directory. This change removes
it.

PR-URL: #14873
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Alexey Orlenko <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>