Rollup merge of #95467 - ChrisDenton:async-read-pipe, r=joshtriplett

Windows: Synchronize asynchronous pipe reads and writes

On Windows, the pipes used for spawned processes are opened for asynchronous access but `read` and `write` are done using the standard methods that assume synchronous access. This means that the buffer (and variables on the stack) may be read/written to after the function returns.

This PR ensures reads/writes complete before returning. Note that this only applies to pipes we create and does not affect the standard file read/write methods.

Fixes #95411

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