DAOS-18921 tests: add sleep for CR29 - b26

[Nasf-Fan]

Wait a while for group membership synchornization.

Skip-build-leap15-rpm: true
Skip-nlt: true
Skip-func-test: true
Test-tag: CatRecovCoreTest

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Ticket title is 'recovery/cat_recov_core.py:CatRecovCoreTest.test_daos_cat_recov_core - CR29 dmg_pool_create failed, rc: -1025'
Status is 'In Progress'
Labels: '2.6.5rc1,2.6.5rc3,daily_test,triaged'
Job should run at elevated priority (1)
https://daosio.atlassian.net/browse/DAOS-18921