enhance: optimize unfiltered search on sealed segments

[CLiqing]

issue: #48279

Optimize the sealed-segment search path when no scalar filter is applied:

• Three-level MVCC fast path (MvccNode): For sealed segments without collection TTL:
  • Level 1 (no deletes): skip all bitmap operations, reuse thread-local zero bitmap, signal downstream via skip_filter flag
  • Level 2 (has deletes): skip mask_with_timestamps, apply only mask_with_delete
  • Level 3 (default): unchanged original path for filtered / growing / TTL queries
• VectorSearchNode skip_filter: When skip_filter is set, pass empty BitsetView to Knowhere, triggering native IDSelectorAll instead of iterating over a full zero bitmap
• Hardware -mpopcnt: Add -mpopcnt compiler flag for x86_64 to use hardware popcnt instruction instead of __popcountdi2 software fallback

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.74%. Comparing base (8900b46) to head (f0d5ead).
⚠️ Report is 12 commits behind head on master.

❌ Your project check has failed because the head coverage (74.74%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #48272       +/-   ##
===========================================
- Coverage   77.53%   74.74%    -2.80%     
===========================================
  Files        2099     1480      -619     
  Lines      348958   244980   -103978     
===========================================
- Hits       270576   183104    -87472     
+ Misses      70137    53607    -16530     
- Partials     8245     8269       +24     

Components	Coverage Δ
Client	78.62% <ø> (ø)
Core	∅ <ø> (∅)
Go	75.62% <92.58%> (-0.09%)	⬇️
see 673 files with indirect coverage changes

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