[ci] Add retries for `docker pull`

[driazati]

Failures like https://ci.tlcpack.ai/blue/organizations/jenkins/tvm/detail/main/3812/pipeline happen from time to time, we should have a retry + backoff (wait 1 second, retry, wait 10 seconds, retry, wait 30 seconds, retry, give up if its still failing) when Jenkins does docker pull:

tvm/ci/jenkins/Prepare.groovy.j2

Line 79 in d436501

script: "docker pull ${image}",

cc @Mousius @areusch