DAOS-16471 test: Reduce targets for ioctl_pool_handles.py (#15063)

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The dfuse/ioctl_pool_handles.py test is overloading the VM so reduce the number of engine targets.

Skip-unit-tests: true
Skip-fault-injection-test: true
Skip-func-test-el9: false
Skip-func-test-leap15: false
Test-tag: test_ioctl_pool_handles

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[github-actions]

Ticket title is 'dfuse/ioctl_pool_handles.py:IoctlPoolHandles.test_ioctl_pool_handles - test timeout causes VM connection time out, skipped tests'
Status is 'In Review'
Labels: 'ci_2.6_daily,ci_master_daily,daily_test,request_for_2.6.1,vm'
https://daosio.atlassian.net/browse/DAOS-16471

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Passed on all 3 VM stages in https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-15071/1/testReport/FTEST_dfuse/IoctlPoolHandles/