test: rename test cases

test-process-geteuid-getegid.js is renamed to test-process-euid-egid.js.

test-process-setuid-setgid.js is renamed to test-process-uid-gid.js.

PR-URL: https://github.com/nodejs/node/pull/19765
Fixes: https://github.com/nodejs/node/issues/19592


Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>