Add ut for task_policies

[XuanYang-cn]

See also: #16652

Signed-off-by: yangxuan xuan.yang@zilliz.com

/kind improvement

[XuanYang-cn]

/cc @congqixia

[codecov]

Codecov Report

Merging #16663 (2ab7c05) into master (bc5e9ec) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #16663      +/-   ##
==========================================
+ Coverage   80.68%   80.75%   +0.07%     
==========================================
  Files         439      439              
  Lines       69426    69472      +46     
==========================================
+ Hits        56015    56104      +89     
+ Misses      10738    10695      -43     
  Partials     2673     2673              

Impacted Files	Coverage Δ
internal/proxy/task_policies.go	66.00% <100.00%> (+31.90%)	⬆️
...nternal/querynode/flow_graph_filter_delete_node.go	80.51% <0.00%> (-5.20%)	⬇️
internal/querynode/flow_graph_delete_node.go	81.25% <0.00%> (-4.17%)	⬇️
internal/distributed/querynode/client/client.go	96.64% <0.00%> (-3.36%)	⬇️
internal/indexcoord/index_coord.go	76.55% <0.00%> (-2.03%)	⬇️
internal/datacoord/segment_manager.go	81.35% <0.00%> (-1.70%)	⬇️
internal/mq/msgstream/mq_msgstream.go	79.18% <0.00%> (-0.59%)	⬇️
internal/mq/mqimpl/rocksmq/server/rocksmq_impl.go	81.27% <0.00%> (-0.38%)	⬇️
internal/querycoord/task.go	76.96% <0.00%> (-0.33%)	⬇️
internal/querynode/query_shard.go	68.35% <0.00%> (-0.27%)	⬇️
... and 26 more

[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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