[release/10.0.1xx] Fix first-run experience output interfering with completion commands #50472
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Backport of #50454 to release/10.0.1xx
/cc @baronfel @copilot
Since this is a behavioral breaking change for Powershell users below a certain version, I'm going to tag this for a breaking change doc/email so we can point those users to the newer powershell setting to make stderr output not automatically get lifted into powershell errors.