Set Correct URL for Failed ISO Builds

[medyagh]

The file is ./hack/jenkins/build_iso.sh

and it should be like this format

https://storage.googleapis.com/minikube-builds/logs/PRNumber/7DigitSHA/iso_build.txt

for example for this PR
https://storage.googleapis.com/minikube-builds/logs/20669/22ed44e/iso_build.txt

Originally posted by @medyagh in #20826 (comment)

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