ci: disable persist-credentials for actions/checkout in system-tests

[cbeauchesne]

What does this PR do?
Add persist-credentials: false to checkout jobs in system-tests workflow

Additional Notes:

How to test the change?

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.86%. Comparing base (3da4cfd) to head (03b140e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3860      +/-   ##
==========================================
+ Coverage   97.85%   97.86%   +0.01%     
==========================================
  Files        1271     1271              
  Lines       75975    75975              
  Branches     3739     3739              
==========================================
+ Hits        74345    74355      +10     
+ Misses       1630     1620      -10     

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[cbeauchesne]

/merge

[dd-devflow]

🚂 MergeQueue: waiting for PR to be ready

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[cbeauchesne]

/merge -c

[dd-devflow]

⚠️ MergeQueue: This merge request was unqueued

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-22 09:04:55

Comparing candidate commit 03b140e in PR branch cbeauchesne/persist-credentials with baseline commit 3da4cfd in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 23 metrics, 2 unstable metrics.