enhance: [cp2.6]add DumpMessages to the Go SDK client (#50343)

[bigsheeper]

Cherry-pick from master

pr: #50343
issue: #47598

Summary

Cherry-picked from master PR #50343 (merged). Adds Client.DumpMessages to the Go SDK (client/milvusclient), mirroring CreateReplicateStream, plus ExampleClient_DumpMessages.

Verified the 2.6-pinned go-api/v2 already exposes the DumpMessages stub / DumpMessagesRequest / GetSalvageCheckpoint, so the code compiles unchanged on 2.6.

Verification

• File count matches original PR (2 files, 82 insertions)
• Per-file diffs verified identical to master PR enhance: add DumpMessages to the Go SDK client #50343
• No conflict markers
• go build / go vet ./milvusclient/ pass on 2.6 (go-api/v2)
• go test -run TestReplicate passes
• make static-check (skipped by cherry-pick workflow)

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bigsheeper
To complete the pull request process, please assign jiaoew1991 after the PR has been reviewed.
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Details

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• client/OWNERS

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[sre-ci-robot]

[INFO] PR Label Summary by Default
[SUCCESS] PR #50343 merged to master

• Title: enhance: add DumpMessages to the Go SDK client
• Link: enhance: add DumpMessages to the Go SDK client #50343

[WARNING] Milestone not set

• PR: enhance: [cp2.6]add DumpMessages to the Go SDK client (#50343) #50370
• Title: enhance: [cp2.6]add DumpMessages to the Go SDK client (enhance: add DumpMessages to the Go SDK client #50343)
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[sre-ci-robot]

[ci-v2-notice]
Notice: New ci-v2 system is enabled for this PR.

To rerun ci-v2 checks, comment with:

• /ci-rerun-code-check // for ci-v2/code-check
• /ci-rerun-code-check-macos // for Code Checker MacOS (GitHub Actions)
• /ci-rerun-build // for ci-v2/build
• /ci-rerun-build-all // for ci-v2/build-all (multi-arch builds)
• /ci-rerun-buildenv // for ci-v2/build-env (build milvus-env builder images)
• /ci-rerun-ut-integration // for ci-v2/ut-integration, will rerun ci-v2/build
• /ci-rerun-ut-go // for ci-v2/ut-go, will rerun ci-v2/build
• /ci-rerun-ut-cpp // for ci-v2/ut-cpp
• /ci-rerun-ut // for all ci-v2/ut-integration, ci-v2/ut-go, ci-v2/ut-cpp, will rerun ci-v2/build
• /ci-rerun-e2e-default // for ci-v2/e2e-default
• /ci-rerun-e2e-amd // for ci-v2/e2e-amd (e2e pool dispatcher)
• /ci-rerun-build-ut-cov // for ci-v2/build-ut-cov (build + unit tests in one pipeline)
• /ci-rerun-gosdk // for ci-v2/go-sdk (Go SDK E2E tests, ARM)

If you have any questions or requests, please contact @zhikunyao.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.68%. Comparing base (cb08db0) to head (0a961c2).
⚠️ Report is 940 commits behind head on 2.6.

Files with missing lines	Patch %	Lines
client/milvusclient/replicate.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.6   #50370      +/-   ##
==========================================
+ Coverage   76.99%   77.68%   +0.68%     
==========================================
  Files        1700     1999     +299     
  Lines      262533   328207   +65674     
==========================================
+ Hits       202142   254952   +52810     
- Misses      53550    65443   +11893     
- Partials     6841     7812     +971     

Components	Coverage Δ
Client	79.35% <74.09%> (+1.21%)	⬆️
Core	84.42% <ø> (+2.21%)	⬆️
Go	75.80% <56.32%> (+0.41%)	⬆️

Files with missing lines	Coverage Δ
client/milvusclient/replicate.go	20.00% <0.00%> (+20.00%)	⬆️

... and 1411 files with indirect coverage changes

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