Update script to support Centipede

The command to run a corpus in centipede's case is
out_dir/centipede --binary=out_dir/fuzzer_name <options>.

Update the script to generate the commands in this format.

Bug: 394107968
Change-Id: I0a9dc969609b2d6d13573477c0d6728287aeb5d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6334095
Commit-Queue: Weizhong Xia <[email protected]>
Reviewed-by: Paul Semel <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1433604}
NOKEYCHECK=True
GitOrigin-RevId: 09e29b14f455b246c1a629f5c7ea49a42a29f753
2 files changed