agent: Fix Claude Code terminal login on Windows (#39325)
Remove the ad-hoc quoting we were doing before, which only works for
POSIX shells, in favor of using `Shell::WithArguments`.
Release Notes:
- N/A
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Co-authored-by: Lukas Wirth <me@lukaswirth.dev>
97f552876cCole Miller committed on 10/2/2025, 12:58:40 PM· committed by GitHubparent63c081d