chore: add hostname to profile export

[Noroth]

Pyroscope profiles are aggregated by tags, so essentially when we aggregate by federated graph id, we might end up seeing multiple profiles accumulated because multiple router instances use the same graph api token.

This PR adds hostname as an additional tag.

Summary by CodeRabbit

• Enhancements
  • Pyroscope telemetry now includes the router’s hostname, providing more detailed monitoring context.

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• If applicable, I have provided instructions for reviewers for manually validating my changes.
• Documentation has been updated on https://github.com/wundergraph/docs-website.
• I have read the Contributors Guide.

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[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-4908123b03a68db2349b60d896fbe81169face6f

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e6720a6f-2e0e-4a61-9caa-5b5c96e5bf23

📥 Commits

Reviewing files that changed from the base of the PR and between 92df9e1 and 9fb53e8.

📒 Files selected for processing (1)

• router/core/router.go

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Walkthrough

Changes

Pyroscope tagging

Layer / File(s)	Summary
Add hostname profiler tag router/core/router.go	Pyroscope configuration now adds the router hostname alongside the existing default tags.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change: adding hostname tags to exported Pyroscope profiles.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
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Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="[linters_context] typechecking error: pattern ./...: directory prefix . does not contain main module or its selected dependencies"

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.03%. Comparing base (8271c7d) to head (9fb53e8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
router/core/router.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3117       +/-   ##
===========================================
+ Coverage   48.81%   62.03%   +13.22%     
===========================================
  Files        1130      262      -868     
  Lines      157426    30815   -126611     
  Branches    10880        0    -10880     
===========================================
- Hits        76842    19116    -57726     
+ Misses      78713    10186    -68527     
+ Partials     1871     1513      -358     

Files with missing lines	Coverage Δ
router/core/router.go	70.27% <0.00%> (+0.34%)	⬆️

... and 880 files with indirect coverage changes

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[endigma]

Can we make this router_hostname and also make it router_custom_modules below?