tools: remove unneeded .gitignore entries

Remove entries from `.gitignore` that are already covered by the generic
`.*` entry on line 2 of the .gitignore file.

PR-URL: https://github.com/nodejs/node/pull/26370


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>