Add reusable GitHub release asset replacement

[PrzemyslawKlys]

Summary

• add reusable GitHub release asset replacement support to PowerForge release publishing
• expose ReplaceExistingAssets on project/tool GitHub release config and schema
• keep duplicate detection available while allowing stable release tags to refresh same-named assets

Validation

• dotnet test PowerForge.Tests\PowerForge.Tests.csproj -c Release --filter "FullyQualifiedNamePowerForgeReleaseServiceTests|FullyQualifiedNameGitHubReleasePublisherTests"
• git diff --check

Consumer

• Needed by EvotecIT/IntelligenceX reviewer publishing to keep a stable reviewer release tag instead of creating timestamped releases.

[chatgpt-codex-connector]

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