rabbit_prometheus_http_SUITE: Start broker once in special_chars
group (backport #12613)
#12614
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init_per_group/3
, which starts the broker, was already called earlier in the function.This fixes a bug where the node can't be stopped in
end_per_group/2
, attecting the next group ability to start one.This is an automatic backport of pull request #12613 done by Mergify.