enhance: Enable dynamic update loaded collection's replica

[weiliu1031]

issue: #35821
pr: #35822
After collection loaded, if we need to increase/decrease collection's replica, we need to release and load it again.

milvus offers 4 solution to update loaded collection's replica, this PR aims to dynamic change the replica number without release, and after replica number changed, milvus will execute load replica or release replica in async, and the replica loaded status can be checked by getReplicas API.

Notice that if set too much replicas than querynode can afford，the new replica won't be loaded successfully until enough querynode joins.

[mergify]

@weiliu1031 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[weiliu1031]

rerun ut

[weiliu1031]

/run-cpu-e2e

[codecov]

Codecov Report

Attention: Patch coverage is 75.37797% with 114 lines in your changes missing coverage. Please review.

Project coverage is 84.96%. Comparing base (b92daa1) to head (6885b01).
Report is 5 commits behind head on 2.4.

Files with missing lines	Patch %	Lines
internal/querycoordv2/job/job_update.go	48.14%	32 Missing and 10 partials ⚠️
internal/querycoordv2/server.go	72.09%	8 Missing and 4 partials ⚠️
internal/metastore/kv/querycoord/kv_catalog.go	31.25%	10 Missing and 1 partial ⚠️
internal/querycoordv2/services.go	88.42%	8 Missing and 3 partials ⚠️
internal/querycoordv2/meta/resource_manager.go	0.00%	9 Missing ⚠️
internal/rootcoord/alter_database_task.go	73.33%	5 Missing and 3 partials ⚠️
internal/querycoordv2/job/job_load.go	72.22%	4 Missing and 1 partial ⚠️
internal/querycoordv2/task/executor.go	61.53%	4 Missing and 1 partial ⚠️
internal/querycoordv2/meta/replica_manager.go	86.20%	2 Missing and 2 partials ⚠️
internal/rootcoord/alter_collection_task.go	88.88%	2 Missing and 1 partial ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #36417      +/-   ##
==========================================
+ Coverage   81.15%   84.96%   +3.80%     
==========================================
  Files        1060      794     -266     
  Lines      139759   115705   -24054     
==========================================
- Hits       113427    98306   -15121     
+ Misses      22061    13088    -8973     
- Partials     4271     4311      +40     

Files with missing lines	Coverage Δ
internal/distributed/querycoord/client/client.go	97.53% <100.00%> (+0.06%)	⬆️
internal/distributed/querycoord/service.go	77.92% <100.00%> (+0.19%)	⬆️
internal/metastore/catalog.go	100.00% <ø> (ø)
internal/querycoordv2/checkers/channel_checker.go	85.61% <100.00%> (+0.19%)	⬆️
internal/querycoordv2/checkers/segment_checker.go	89.73% <100.00%> (-0.31%)	⬇️
internal/querycoordv2/utils/meta.go	73.10% <100.00%> (+10.28%)	⬆️
pkg/config/etcd_source.go	85.71% <100.00%> (ø)
tests/integration/minicluster_v2.go	74.07% <100.00%> (+0.26%)	⬆️
internal/querycoordv2/meta/collection_manager.go	88.52% <86.66%> (-0.08%)	⬇️
internal/util/mock/grpc_querycoord_client.go	94.73% <0.00%> (-2.57%)	⬇️
... and 10 more

... and 297 files with indirect coverage changes

[mergify]

@weiliu1031 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

@weiliu1031 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, weiliu1031

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