Logging bytesize for some response messages

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179755



Merged-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Rodrigo Tomonari <rtomonari@gitlab.com>
Approved-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Kevin Morrison <kmorrison@gitlab.com>
Reviewed-by: Rodrigo Tomonari <rtomonari@gitlab.com>
Reviewed-by: Max Fan <mfan@gitlab.com>
Co-authored-by: Max Fan <mfan@gitlab.com>