ci: add facility to run sysbench WF in debug mode

The perf_sysbench.yml workflow has the 'workflow_dispatch' trigger
that is often used to test some workflow changes. To not litter in
the InfluxDB prod bucket, MyTeam chat and mailing list, the special
option is added (Debug mode). When checking this option the InfluxDB
test bucket, MyTeam chat, and mailing list will be used.

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

(cherry picked from commit e77ecdd4)