DAOS-16310 test: consolidate il and ioil tags (#14881)

[daltonbohning]

Update il -> ioil for consistency

Skip-unit-tests: true
Skip-fault-injection-test: true
Allow-unstable-test: true

Required-githooks: true

Before requesting gatekeeper:

• Two review approvals and any prior change requests have been resolved.
• Testing is complete and all tests passed or there is a reason documented in the PR why it should be force landed and forced-landing tag is set.
• 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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• Githooks were used. If not, request that user install them and check copyright dates.
• Checkpatch issues are resolved. Pay particular attention to ones that will show up on future PRs.
• All builds have passed. Check non-required builds for any new compiler warnings.
• Sufficient testing is done. Check feature pragmas and test tags and that tests skipped for the ticket are run and now pass with the changes.
• If applicable, the PR has addressed any potential version compatibility issues.
• Check the target branch. If it is master branch, should the PR go to a feature branch? If it is a release branch, does it have merge approval in the JIRA ticket.
• Extra checks if forced landing is requested
  • Review comments are sufficiently resolved, particularly by prior reviewers that requested changes.
  • No new NLT or valgrind warnings. Check the classic view.
  • Quick-build or Quick-functional is not used.
• Fix the commit message upon landing. Check the standard here. Edit it to create a single commit. If necessary, ask submitter for a new summary.

[github-actions]

Ticket title is 'ftest: consolidate il and ioil tags'
Status is 'Awaiting backport'
Job should run at elevated priority (1)
https://daosio.atlassian.net/browse/DAOS-16310

[daosbuild1]

Test stage Functional Hardware Medium completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14979/1/execution/node/1097/log

[daltonbohning]

Failures in https://build.hpdd.intel.com/blue/organizations/jenkins/daos-stack%2Fdaos/detail/PR-14979/1/tests
pil4dfs_fio.py - https://daosio.atlassian.net/browse/DAOS-16315