Windows Package Manager Manifest Creator v1.28.1.0

What's Changed

• Fix pipeline NuGet restore failure under network isolation policy by AmirMS (@AmelBawa-msft) in #682
• Fix code warnings and improve stability by AmirMS (@AmelBawa-msft) in #684
• Update notice txt file by AmirMS (@AmelBawa-msft) in #685
• Update pipeline configuration by AmirMS (@AmelBawa-msft) in #688
• Add Duplicate Surfacing agentic workflow (pilot from winget-cli) by Demitrius Nelon (@denelon) in #687
• Clean up Duplicate Surfacing comment noise (#689) by Demitrius Nelon (@denelon) in #690
• Add Copilot-Instructions label policy rule by Demitrius Nelon (@denelon) in #694
• Add .github/copilot-instructions.md by Demitrius Nelon (@denelon) in #692
• Add agent guidance for issues and PRs by Demitrius Nelon (@denelon) in #695
• Move telemetry source configuration to pipeline variables by AmirMS (@AmelBawa-msft) in #698
• [Cherry pick] Pin GitHub Actions to full-length commit SHAs by AmirMS (@AmelBawa-msft) with @Copilot in #704
• Bump the github-actions group with 3 updates by Dependabot (@dependabot)[bot] in #708
• Use read-only pull request spell checks without bot comments by AmirMS (@AmelBawa-msft) in #709
• Bump manifest schema version to 1.28.0 by Muhammad Danish (@mdanish-kh) in #711

Full Changelog: v1.12.13.0...v1.28.1.0