Scrub File prefix from internal File*Result types #36666
Description
As part of #34296, we added Results.Stream, Results.File etc as we thought the existing names were less descriptive. However the PR did not rename the implementing types. While they're non-public, they appear in log messages e.g:
info: Microsoft.AspNetCore.Http.Result.FileStreamResult[1]
Executing FileStreamResult, sending file with download name ''.
It would be nice to scrub these names too to match the Result types.