enhance: Move SyncCreatedPartition step to proxy

[congqixia]

Related to #38275

This PR move sync created partition step to proxy to avoid potential logic deadlock when create partition happens with target segment change.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia

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• internal/proxy/OWNERS [congqixia]
• internal/rootcoord/OWNERS [congqixia]

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[codecov]

Codecov Report

Attention: Patch coverage is 42.10526% with 11 lines in your changes missing coverage. Please review.

Project coverage is 81.05%. Comparing base (7a5aea1) to head (c052847).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/proxy/task.go	38.88%	8 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38296      +/-   ##
==========================================
- Coverage   81.08%   81.05%   -0.04%     
==========================================
  Files        1372     1372              
  Lines      191671   191677       +6     
==========================================
- Hits       155412   155358      -54     
- Misses      30762    30815      +53     
- Partials     5497     5504       +7     

Components	Coverage Δ
Client	74.58% <ø> (ø)
Core	68.83% <ø> (ø)
Go	83.16% <42.10%> (-0.04%)	⬇️

Files with missing lines	Coverage Δ
internal/proxy/impl.go	84.92% <100.00%> (+<0.01%)	⬆️
internal/rootcoord/create_partition_task.go	90.80% <ø> (-0.60%)	⬇️
internal/rootcoord/step.go	86.80% <ø> (+1.27%)	⬆️
internal/proxy/task.go	86.66% <38.88%> (-0.38%)	⬇️

... and 33 files with indirect coverage changes

[liliu-z]

/lgtm