src: always use diagnostic file sequence number

This commit attaches a sequence number to all filenames that
are automatically generated by DiagnosticFilename. This prevents
accidental overwriting of existing files.

PR-URL: https://github.com/nodejs/node/pull/27142


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>