PR Summary

This pull request updates the CHANGELOG/7.4.md file to add release notes for version 7.4.12. The changes document new tooling, build and packaging improvements, and updates to documentation and help content.

Tooling updates:

• Added CodeQL suppressions to improve security analysis coverage.

Build and packaging improvements:

• Updated .NET SDK to version 8.0.413 for improved compatibility and support.
• Updated container images to use mcr.microsoft.com for Linux and Azure Linux, enhancing consistency and reliability.
• Added LinuxHost network configuration to the PowerShell Packages pipeline for better deployment options.
• Made logical template names consistent across pipelines to reduce confusion and errors.
• Removed AsyncSDL from pipelines to simplify official and nonofficial runs.

Documentation updates:

• Updated third-party library versions to 8.0.19 for ObjectPool, Windows Compatibility, and System.Drawing.Common, ensuring up-to-date dependencies.

PR Context

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge. If this PR is a work in progress, please open this as a Draft Pull Request and mark it as Ready to Review when it is ready to merge.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed