DAOS-8279 test: Add Avocado tests to run simple cmocka tests

[shimizukko]

Add the following cmocka tests as Avocado tests. src/tests/simple_array.c src/tests/simple_obj.c src/tests/simple_dfs.c

Updated src/tests/SConscript to build them as binary and place them where the Avocado test can access.

Created new ftest/api directory and added the new test there.

Skip-unit-tests: true Skip-fault-injection-test: true Test-tag: test_simple_array test_simple_obj test_simple_dfs Skip-func-hw-test-medium-md-on-ssd: false

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• [ ] Two review approvals and any prior change requests have been resolved.
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• [ ] Features: (or Test-tag*) commit pragma was used or there is a reason documented that there are no appropriate tags for this PR.
• [ ] Commit messages follows the guidelines outlined here.
• [ ] Any tests skipped by the ticket being addressed have been run and passed in the PR.

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[github-actions[bot]]

Ticket title is 'simple example in tests should be run in CI' Status is 'In Progress' Labels: 'scrubbed,triaged' https://daosio.atlassian.net/browse/DAOS-8279

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Test stage Build RPM on EL 8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14314/1/execution/node/309/log

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Test stage Functional Hardware Medium MD on SSD completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14314/7/execution/node/900/log

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Test stage Functional Hardware Medium completed with status FAILURE. https://build.hpdd.intel.com/job/daos-stack/job/daos/job/PR-14314/7/display/redirect

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Test stage Test RPMs on EL 8.6 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14314/8/execution/node/741/log

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Test stage Test RPMs on EL 8.6 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14314/9/execution/node/740/log

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Test stage Test RPMs on EL 8.6 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14314/10/execution/node/740/log