Clean flowGraph if watchChannel failed

[xige-16]

fix issue: #15293
/kind bug
Signed-off-by: xige-16 [email protected]

[mergify]

@xige-16 E2e jenkins job failed, comment /run-checks can trigger the job again.

[bigsheeper]

/lgtm

[codecov]

Codecov Report

Merging #15303 (2174dfe) into master (bbb672c) will increase coverage by 0.10%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master   #15303      +/-   ##
==========================================
+ Coverage   79.63%   79.73%   +0.10%     
==========================================
  Files         450      450              
  Lines       61441    61408      -33     
==========================================
+ Hits        48928    48965      +37     
+ Misses      10168    10115      -53     
+ Partials     2345     2328      -17     

Impacted Files	Coverage Δ
internal/querynode/task.go	83.33% <72.05%> (+4.66%)	⬆️
internal/querynode/collection_replica.go	87.46% <100.00%> (+0.73%)	⬆️
internal/querynode/data_sync_service.go	100.00% <100.00%> (ø)
internal/querynode/flow_graph_delete_node.go	81.25% <0.00%> (-7.30%)	⬇️
...nternal/util/rocksmq/client/rocksmq/client_impl.go	78.15% <0.00%> (-1.69%)	⬇️
internal/util/flowgraph/node.go	72.26% <0.00%> (-0.85%)	⬇️
internal/querycoord/task.go	80.20% <0.00%> (+0.19%)	⬆️
internal/querycoord/task_scheduler.go	75.38% <0.00%> (+0.35%)	⬆️
internal/proxy/impl.go	84.48% <0.00%> (+0.49%)	⬆️
... and 4 more

[czs007]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, xige-16

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