[Test] Revert the test_slurm_custom_partitions test-only fix

[hehe7318]

Description of changes

• Revert [Integ-test] Fix test_slurm_custom_partitions intermittent failure by restore the protected failure count #7433
• Add changelog for the product code fix.

References

• Product fix in node package: [Node] Reset all partition nodes on cluster stop aws-parallelcluster-node#707

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