[fix][proxy] PIP-478: resolve the proxy's broker-client credential off the event loop - #26328

[fix][proxy] PIP-478: resolve the proxy's broker-client credential off the event loop#26328

lhotari wants to merge 3 commits into

lh-pip-478-admin-auth-executorapache/pulsar:lh-pip-478-admin-auth-executorfrom

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