Test262: accept ENOTEMPTY and EEXIST in fs/rename.t.mjs

Test262: accept ENOTEMPTY and EEXIST in fs/rename.t.mjs

Renaming a regular file onto an existing directory is permitted by POSIX
to fail with EISDIR, ENOTDIR, ENOTEMPTY or EEXIST, and the exact errno
depends on the kernel and filesystem.  The test only accepted ENOTDIR
and EISDIR, so it began failing on the ubuntu-26.04 CI runners whose
newer kernel returns ENOTEMPTY (or EEXIST) for this case.

Accept ENOTEMPTY and EEXIST in all three variants (sync, callback and
promise based) to make the test robust across kernels while still
rejecting genuinely unexpected errors.