DAOS-16084 test: make FI required for pool/cont retry tests

[kccain]

Before this change, daos_test -p pool_op_retry() and daos_test -c co_op_retry() functions still executed even if fault injection support was disabled in the daos build. In release build testing, the tests then failed since they expected actual fault behavior on the engine side that did not get triggered.

With this change, the FAULT_INJECTION_REQUIRED() macro is invoked at the start of the test functions to skip them.

Skip-unit-tests: true
Skip-fault-injection-test: true
Test-tag: test_daos_pool test_daos_container
faults-enabled: false

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• Any tests skipped by the ticket being addressed have been run and passed in the PR.

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[github-actions]

Ticket title is 'daos_test/suite.py:DaosCoreTest.test_daos_pool - DAOS_Pool.POOL13 src/tests/suite/daos_pool.c:776: error: Failure!'
Status is 'Open'
Labels: '2.6.0rc1,ci_impact,pr_test'
https://daosio.atlassian.net/browse/DAOS-16084

[kccain]

@daos-stack/daos-gatekeeper note the cherry-pick PR for release/2.6 branch is also ready #14644