fix: etcd not connectable when auth enabled

[xiaofan-luan]

Fix etcd config source didn't respect auth enabled
Also removed pulsar recoverable error when pulsar return ConsumerBusy. It could happen that pulsar didn't find the original consumer is dead and recover takes some time.
fix: #31631
pr: #31633

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.77%. Comparing base (bd6f123) to head (97781a1).
Report is 12 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #31668      +/-   ##
==========================================
- Coverage   80.81%   80.77%   -0.04%     
==========================================
  Files         974      974              
  Lines      137886   137890       +4     
==========================================
- Hits       111429   111383      -46     
- Misses      22746    22787      +41     
- Partials     3711     3720       +9     

Files	Coverage Δ
pkg/config/etcd_source.go	81.48% <100.00%> (+0.52%)	⬆️
pkg/config/source.go	100.00% <ø> (ø)
pkg/mq/msgstream/mqwrapper/pulsar/pulsar_client.go	80.17% <ø> (+0.51%)	⬆️
pkg/util/etcd/etcd_util.go	77.07% <ø> (ø)
pkg/util/paramtable/base_table.go	80.53% <100.00%> (+0.39%)	⬆️

... and 32 files with indirect coverage changes

[czs007]

/lgtm