Cherry-pick #12086 to 7.0: Don't generate autodiscover config when no port matches host hints #12141
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Cherry-pick of PR #12086 to 7.0 branch. Original message:
On metricbeat, when the host autodiscover hint is used, and it includes
the port, one of the exposed ports has to match with the one in the
hint. If not, no configuration should be generated. If it is generated,
it will have empty hosts, what would lead to unexpected errors as the
ones seen in #8264.
Fixes #8264