download_goldctl.sh should retry if the depot_tools clone fails #44786
Description
Use case
It looks like sometimes cloning depot_tools fails on Cirrus (network issues?).
ulimit -S -n 2048
./dev/bots/download_goldctl.sh
Cloning into './depot_tools'...
error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 60
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
./dev/bots/download_goldctl.sh: line 4: cd: depot_tools: No such file or directory
./dev/bots/download_goldctl.sh: line 6: ./cipd: No such file or directory
Exit status: 127
https://cirrus-ci.com/task/5949937388355584?command=main#L0
Proposal
Consider a sleep and retry as is done in a few other tests. With increased control logic, it may be a good time to migrate to a dart test.