[Tests] Deduplicate shared test case names

[mrz1836]

What Changed

• Introduced shared constants for recurring test case names in safe_conversion_test.go
• Reused the new constants across all table-driven tests to eliminate repeated literals

Why It Was Necessary

• SonarCloud flagged dozens of duplicated string literals across the conversion tests, impacting maintainability
• Centralizing the labels improves readability and keeps future updates consistent

Testing Performed

• golangci-lint run
• go test ./...

Impact / Risk

• No functional behavior changes; updates are limited to test code
• Low risk: refactor only touches test naming and keeps expectations unchanged

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https://chatgpt.com/codex/tasks/task_e_68e81bfe5a588321b70cbfcc13455b01

[Copilot]

Pull Request Overview

This PR deduplicates test case names by introducing shared constants in safe_conversion_test.go. Previously, identical string literals like "zero value", "positive value", and "max uint32" were repeated across multiple table-driven tests.

• Introduced 14 shared constants for common test case names
• Replaced all hardcoded string literals with the corresponding constants across 20+ test functions
• Maintained identical test behavior while improving maintainability

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[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