Fixes https://emqx.atlassian.net/browse/EMQX-10228
This is a cosmetic fix for the Pulsar Producer bridge health check status.
Pulsar connection process is asynchronous, therefore, when a bridge of this type is
created or updated (which is the same as stopping and re-creating it), the immediate
status will be connecting because it’s indeed still connecting. The bridge will connect
very soon afterwards (assuming there are no true network/config issue), but having to
refresh the UI to see the new status and/or seeing the resource alarm might annoy users.
This workaround adds a few retries to account for that effect to reduce the probability of
seeing the `connecting` state on such happy-paths.
Thales Macedo Garitezi