[release-3.6] Fix a log formatting bug in the e2e downgrade tests

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #19367

/assign ahrtr

[k8s-ci-robot]

Hi @k8s-infra-cherrypick-robot. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ahrtr]

/ok-to-test

[ahrtr]

/test pull-etcd-e2e-arm64

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.89%. Comparing base (bf1f998) to head (abbf79f).
Report is 2 commits behind head on release-3.6.

Additional details and impacted files

see 25 files with indirect coverage changes

@@               Coverage Diff               @@
##           release-3.6   #19390      +/-   ##
===============================================
- Coverage        68.91%   68.89%   -0.02%     
===============================================
  Files              420      420              
  Lines            35764    35764              
===============================================
- Hits             24645    24641       -4     
- Misses            9693     9695       +2     
- Partials          1426     1428       +2     

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, k8s-infra-cherrypick-robot

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