Fix: when zk remoting.EventTypeAdd event send fail, need delete the path from zk listener pathmap

[jack15083]

What this PR does:

Which issue(s) this PR fixes:

Fixes #1274

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #1273 (0442424) into 1.5 (a10ff4d) will decrease coverage by 7.63%.
The diff coverage is 60.90%.

@@            Coverage Diff             @@
##              1.5    #1273      +/-   ##
==========================================
- Coverage   66.13%   58.50%   -7.64%     
==========================================
  Files         174      273      +99     
  Lines        9343    13273    +3930     
==========================================
+ Hits         6179     7765    +1586     
- Misses       2541     4542    +2001     
- Partials      623      966     +343     

Impacted Files	Coverage Δ
cluster/cluster_impl/available_cluster_invoker.go	66.66% <ø> (-6.67%)	⬇️
cluster/cluster_impl/broadcast_cluster_invoker.go	76.47% <ø> (-3.53%)	⬇️
cluster/cluster_impl/failfast_cluster_invoker.go	66.66% <ø> (-4.77%)	⬇️
cluster/cluster_impl/mock_cluster.go	0.00% <0.00%> (ø)
cluster/loadbalance/random.go	100.00% <ø> (ø)
cluster/router/healthcheck/factory.go	66.66% <0.00%> (ø)
common/extension/auth.go	0.00% <ø> (ø)
common/extension/cluster.go	0.00% <ø> (ø)
common/extension/cluster_interceptor.go	0.00% <0.00%> (ø)
common/extension/config_center.go	0.00% <ø> (ø)
... and 388 more

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[Da-Hong]

上面用的这个dubboPath
_, ok := l.pathMap[dubboPath]
下面用成zkPath了
delete(l.pathMap, zkPath)