Floss: Refactor send_response to pass the value correctly

The method try_into cannot convert a variable length vector into a
fixed size array, so instead of using try_into, you can use a loop
to copy the elements of the value vector into a fixed size array.

Bug: 267596712
Test: Manually
Tag: #floss
Change-Id: I745ad3f9ef65ebd410173ea3a4463a093f64105e