test: remove duplicate test-child-process-execfilesync-maxBuffer.js
In addition correct the comment about what it does.
This is produced by
mv test/parallel/test-child-process-execfilesync-maxBuffer.js test/parallel/test-child-process-execfilesync-maxbuf.js
If you use https://github.com/nodejs/node/pull/28139/files?w=1 to view the diff you can see they aren't doing anything too different.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines