DAOS-18921 tests: add sleep for CR29 - b28

[Nasf-Fan]

Wait a while for group membership synchornization.

Temporarily disable some CR tests for CHK leader switch trouble.

Skip-unit-tests: true
Skip-fault-injection-test: true
Skip-nlt: true
Skip-func-test-vm: true
Test-tag: test_daos_cat_recov_core

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 Review'
Labels: '2.6.5.p1rc1,2.6.5rc1,2.6.5rc3,2.8.0rc1,2.8.0rc2,daily_test,release_build,triaged'
https://daosio.atlassian.net/browse/DAOS-18921

[daosbuild3]

Test stage Functional on EL 9 completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-18689/1/execution/node/930/log

[daosbuild3]

Test stage Functional Hardware Medium MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-18689/1/execution/node/1156/log

[daosbuild3]

Test stage Functional Hardware Medium Verbs Provider MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-18689/2/execution/node/1023/log