fix: load collection stucks if compaction/gc happens

[weiliu1031]

issue: #39680
if compaction/gc happens, load collection may stuck due to SegmentNotFound, we should trigger UpdateNextTarget to get a new data view to execute loading operation.

[codecov]

Codecov Report

Attention: Patch coverage is 60.37736% with 21 lines in your changes missing coverage. Please review.

Project coverage is 80.11%. Comparing base (d3e32bb) to head (e1616a9).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/integration/util_collection.go	48.78%	16 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #39701       +/-   ##
===========================================
+ Coverage   69.39%   80.11%   +10.72%     
===========================================
  Files         302     1480     +1178     
  Lines       27077   204864   +177787     
===========================================
+ Hits        18790   164132   +145342     
- Misses       8287    34861    +26574     
- Partials        0     5871     +5871     

Components	Coverage Δ
Client	79.44% <ø> (∅)
Core	69.39% <ø> (ø)
Go	81.85% <100.00%> (∅)

Files with missing lines	Coverage Δ
internal/querycoordv2/observers/target_observer.go	86.31% <100.00%> (ø)
internal/querycoordv2/task/scheduler.go	87.64% <100.00%> (ø)
tests/integration/util_collection.go	75.29% <48.78%> (ø)

... and 1175 files with indirect coverage changes

[weiliu1031]

rerun ut

[weiliu1031]

rerun ut

[mergify]

@weiliu1031 go-sdk check failed, comment rerun go-sdk can trigger the job again.

[weiliu1031]

rerun go-sdk

[bigsheeper]

/lgtm

[congqixia]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• internal/querycoordv2/observers/OWNERS [congqixia]
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• tests/integration/OWNERS [congqixia]

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