Fix robustness test logs by identifing failpoint availability on temporary cluster before creating subtest

[serathius]

cc @ahrtr @fuweid @henrybear327 @siyuanfoundation @MadhavJivrajani

[k8s-ci-robot]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (7b429f9) to head (1a9d5fb).
Report is 2 commits behind head on main.

❗ Current head 1a9d5fb differs from pull request most recent head fee12d0

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Additional details and impacted files

see 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18685      +/-   ##
==========================================
+ Coverage   68.80%   68.82%   +0.01%     
==========================================
  Files         420      420              
  Lines       35540    35540              
==========================================
+ Hits        24455    24460       +5     
+ Misses       9666     9651      -15     
- Partials     1419     1429      +10     

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[k8s-ci-robot]

@serathius: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-robustness-amd64	fee12d0	link	true	/test pull-etcd-robustness-amd64
pull-etcd-robustness-arm64	fee12d0	link	true	/test pull-etcd-robustness-arm64

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[k8s-ci-robot]

PR needs rebase.

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