Nebius GoSDK integration enhancement

[complynx]

No description provided.

[greptile-apps]

Greptile Summary

This PR enhances the Nebius provider integration by upgrading github.com/nebius/gosdk from a pseudo-version to the proper semver release v0.2.0, and uses the newly available gosdk.WithUserAgentPrefix option to identify outgoing API requests with the nvidia-topograph product name and version. It also bumps google.golang.org/protobuf to v1.36.11 and the associated buf.build indirect dependency.

Key changes:

• Upgrades github.com/nebius/gosdk from pseudo-version v0.0.0-20250925083101-fd7444ff5a96 to v0.2.0 (first proper release)
• Adds getUserAgentPrefix(version string) string helper that produces nvidia-topograph or nvidia-topograph/<version> depending on whether a version is set
• Wires the helper into gosdk.New(...) so all Nebius API calls carry an identifying User-Agent prefix
• Adds TestGetUserAgentPrefix covering empty, whitespace-only, and normal version strings
• Dependency updates are straightforward and well-tested

The changes are well-scoped, clearly tested, and the dependency upgrade is straightforward. No issues identified.

Confidence Score: 5/5

• PR is safe to merge; changes are well-scoped, tested, and dependency upgrades are straightforward.
• All changes are focused, properly tested, and follow good practices. Dependency upgrades are to stable releases. The implementation of the User-Agent prefix feature is correct and integrates cleanly with the existing codebase. No functional or structural issues identified.
• No files require special attention.

_{Last reviewed commit: 71ff004}

[dmitsh]

@complynx , please add "signed-off-by" to your commit (git commit -s)

[complynx]

@complynx , please add "signed-off-by" to your commit (git commit -s)

Done

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 66.38%. Comparing base (981ff93) to head (71ff004).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/providers/nebius/provider.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
+ Coverage   66.35%   66.38%   +0.02%     
==========================================
  Files          82       82              
  Lines        4559     4563       +4     
==========================================
+ Hits         3025     3029       +4     
  Misses       1415     1415              
  Partials      119      119              

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[dmitsh]

@complynx, some minor issue with formatting. PTAL

[dmitsh]

@complynx , thank you for your contribution