0.23.2

Cherry picks:

• 6ca7763:
  Fix a typo
• 2310b1c:
  Ignore SIGCHLD in test setup script
• f9eb1b5:
  Complete channel initialization in the event loop
• f0a1597:
  remote: properly reset state when using remote cache. Fixes #7555
• 56366ee:
  Set non-empty values for msvc_env_* when VC not installed

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