Flake Bot PR commenter should Update the comment instead of making a new comment

[medyagh]

minikube has a bot that comments how flaky a test failure on the PR is, but each different test run generates a new comment,
but it should Update the existing comment.
Example:
#15840 (comment)

this is the line that comments on the PRs

https://github.com/medyagh/minikube/blob/99756bef0b9a90b9097668cb4e9c255f387cbadd/hack/jenkins/test-flake-chart/report_flakes.sh#L130

one way of doing it might be changing this
line
gh pr comment "https://github.com/kubernetes/minikube/pull/$PR_NUMBER" --body "$(cat $TMP_COMMENT)"
to (add --edit-last)
gh pr comment "https://github.com/kubernetes/minikube/pull/$PR_NUMBER" --edit-last --body "$(cat $TMP_COMMENT)"

the only problem is the minikube-pr-bot also updates the Performance data too which means if the last data was Performance data, it will over-write it.... (example of the performance PR comment)

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/lifecycle stale

[spowelljr]

Instead we hide the previous comments now