Update README.md

[mdanish-kh]

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Description of the changes

• Updated the telemetry opt-out instructions to align with the operating system's latest version

• Users may forgetfully commit Test.runsettings file containing their GitHub token after running the E2E tests. Added some documentation for user awareness.

  Reference for git update-index --skip-worktree: https://learn.microsoft.com/en-us/azure/devops/repos/git/ignore-files?view=azure-devops&tabs=visual-studio-2022#use-git-update-index-to-ignore-changes

• General markdown fixes, added a build status label.

  Microsoft Reviewers: Open in CodeFlow

[ryfu-msft]

/azp run

[azure-pipelines[bot]]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.