[release/10.0.1xx] Fix first-run experience output interfering with completion commands#50472

Merged

baronfel merged 7 commits intorelease/10.0.1xxfrom

backport/pr-50454-to-release/10.0.1xx

Aug 26, 2025

Commits on Aug 25, 2025

Initial plan

Copilot
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Fix first-run experience to output to stderr instead of stdout

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Remove unintended files from commit

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Fix ItShowsTheAppropriateMessageToTheUser test to check stderr instead of stdout

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Change WindowsOnlyFact to Fact for ItShowsTheAppropriateMessageToTheUser test and update copilot-instructions with test running guidance

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Commits on Aug 26, 2025