fix: [cp2.6] support CPU adaptation for GPU CAGRA loading (#50096)

[marcelo-cjl]

Cherry-pick from master

pr: #50096
issue: #49836

Summary

• Treat GPU CAGRA indexes with adapt_for_cpu enabled as CPU-adapted in QueryNode resource checks.
• Apply the same GPU requirement check when estimating segment load resources and collection GPU index flags.
• Keep the Milvus-side OpenBLAS Conan option needed by the current Knowhere dependency set on 2.6.

Test plan

• git diff --check upstream/2.6..HEAD
• GO_DIFF_FILES="internal/datanode/index_services_test.go internal/querynodev2/segments/collection.go internal/querynodev2/segments/collection_test.go internal/querynodev2/segments/segment_loader.go internal/querynodev2/segments/segment_loader_test.go" make fmt
• go test -count=1 -tags test ./internal/querynodev2/segments -run 'TestGpuIndexRequiresGpu|TestCollectionManagerSuite/TestGpuIndexFlagWithCagraAdaptForCPU' blocked locally because this clean 2.6 workspace has not built internal/core/output/lib/libmilvus_core.so.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: marcelo-cjl
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Details

Needs approval from an approver in each of these files:

• internal/core/OWNERS
• internal/datanode/OWNERS
• internal/querynodev2/segments/OWNERS

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[sre-ci-robot]

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[sre-ci-robot]

[INFO] PR Label Summary by Default
[FAILED] PR #50096 not merged

• Title: fix: support CPU adaptation for GPU CAGRA loading
• Status: OPEN
• Link: fix: support CPU adaptation for GPU CAGRA loading #50096

Use /refresh-label to update related check and label manually

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.57%. Comparing base (cb08db0) to head (62ce95a).
⚠️ Report is 940 commits behind head on 2.6.

❗ There is a different number of reports uploaded between BASE (cb08db0) and HEAD (62ce95a). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (cb08db0)	HEAD (62ce95a)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##              2.6   #50385       +/-   ##
===========================================
- Coverage   76.99%   42.57%   -34.42%     
===========================================
  Files        1700       12     -1688     
  Lines      262533     1893   -260640     
===========================================
- Hits       202142      806   -201336     
+ Misses      53550     1035    -52515     
+ Partials     6841       52     -6789     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	∅ <ø> (∅)
Go	∅ <ø> (∅)
see 1697 files with indirect coverage changes

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