DAOS-15919 chk: rollback generation if failed to start checker

[Nasf-Fan]

The chk_bookmark::cb_gen for leader may be refreshed during start checker even if the start process failed for some reason finally. Under such case, we need to recover the chk_bookmark::cb_gen back to its original value (before the failed 'chk start'); otherwise, if some former in-running instance failed current 'chk start', it will affect subsequent 'chk stop' command to stop such instance.

Test-tag: cat_recov

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[github-actions]

Ticket title is 'recovery/cat_recov_core.py:CatRecovCoreTest.test_daos_cat_recov_core - CR10 DER_INVAL(-1003) != DER_SUCCESS(0)'
Status is 'In Progress'
Labels: 'ci_impact,daily_test,triaged'
https://daosio.atlassian.net/browse/DAOS-15919

[Nasf-Fan]

Related patch has been landed to master, wait for backport to release/2.6