Rollup merge of #157879 - SebTardif:fix-powershell-download-fallback, r=clubby789 bootstrap: fix inverted success check in PowerShell download fallback When curl fails on Windows and bootstrap falls back to PowerShell for downloads, the success/failure check is inverted: the code returns early on failure (`is_failure()`) and prints "spurious failure, trying again" on success, then exits with code 1 after three successful downloads. This was introduced in rust-lang/rust#141909 during the `ExecutionContext` refactoring. The original code used `self.try_run(...)` which returned `bool` (true = success). The refactoring changed the return type to `CommandOutput` but used `is_failure()` for the early-return check, inverting the logic. The fix changes the check from `is_failure()` to `is_success()`, restoring the original behavior: return early when the download succeeds, retry when it fails.
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