fix: Fix slow dist handle and slow observe

[bigsheeper]

1. Provide partition-level indexing in the collection target.
2. Make SegmentAction not wait for distribution.
3. Optimize logging to reduce CPU overhead.

issue: #37630

[bigsheeper]

slow dist handling:

slow observation:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.32%. Comparing base (4df444e) to head (f4b2487).

❗ Current head f4b2487 differs from pull request most recent head 8802f4e

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HEAD has 1 upload less than BASE

Flag	BASE (4df444e)	HEAD (f4b2487)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #38566       +/-   ##
===========================================
- Coverage   81.09%   69.32%   -11.77%     
===========================================
  Files        1383      292     -1091     
  Lines      195636    26184   -169452     
===========================================
- Hits       158642    18153   -140489     
+ Misses      31404     8031    -23373     
+ Partials     5590        0     -5590     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	69.32% <ø> (-0.12%)	⬇️
Go	∅ <ø> (∅)

see 1117 files with indirect coverage changes

[mergify]

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[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• internal/querycoordv2/dist/OWNERS
• internal/querycoordv2/meta/OWNERS
• internal/querycoordv2/observers/OWNERS
• internal/querycoordv2/task/OWNERS
• internal/querycoordv2/utils/OWNERS
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