[Tests] Deduplicate error prefix in examples

[mrz1836]

What Changed

• Introduced a shared errorPrefix constant for the example tests to remove the repeated string literal.
• Updated each example's error logging to use the shared constant for consistency.

Why It Was Necessary

• Resolves the lint warning that flagged the repeated "error:" literal across the example suite.

Testing Performed

• go test ./...
• golangci-lint run (fails: unknown linters arangolint, embeddedstructfieldcheck, wsl_v5 in the current toolchain)

Impact / Risk

• Breaking Changes: None.
• Regression Risk: Low; only constant reuse in examples.
• Performance: No impact.
• Developer Experience: Reduces future lint noise.

---

https://chatgpt.com/codex/tasks/task_e_68e81be1e1d48321a0fbbf3325040218

[Copilot]

Pull Request Overview

This PR deduplicates a repeated string literal "error:" across example test functions by introducing a shared constant. The change resolves a lint warning about repeated string literals and improves maintainability.

• Introduced a shared errorPrefix constant containing "error:"
• Updated all example functions to use the constant instead of the string literal

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud