fs: WritableStream issues

[ronag]

• error can be emitted after close
  • write after end
  • invalid argument
• open can be emitted after error
• does not use errorOrDestroy on close()
• should not emit error, use errorOrDestroy or callback.
• _write does an unnecessary check for instanceof Buffer (fs: unecessary argument validation #29043).
• calling write before fd and closing, will cause write to happen on destroyed stream (i.e. flush after destroy)
• don't use end() instead of destroy(). Keep track of pendingcb instead. (related issue stream: Writable should not invoke _destroy while pending ops #29044)
• emit 'close' on destroy
• emit 'close' close error

[ronag]

I'm moving this into my own list and will open PR's accordingly when my number of open PR's drop.