[WIP] GREP_OPTIONS Color settings cause shell output failure

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Describe the bug.

See context at dotnet/install-scripts#602
We should unset this variable in the command executor or when we call the invoker

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Reproduction Steps

see issue

Expected Behavior

see issue

Exceptions & Errors (if any)

No response

.NET Install Tool Version

latest

Your operating system? Please provide more detail, such as the version and or distro above.

N/A

VS Code Version

No response

Fixes #2269.

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[nagilson]

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[Copilot]

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[nagilson]

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[Copilot]

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