cmd/go: disallow profile flags when using -fuzz

Disallow the usage of coverprofile, blockprofile, cpuprofile, memprofile,
mutexprofile, and trace when fuzzing, since these currently do not work
as the user would expect.

Fixes #48178

Change-Id: Ibe6dfaef9b28a91c60c26fcad38c33a2a959d869
Reviewed-on: https://go-review.googlesource.com/c/go/+/360395


Trust: Roland Shoemaker <roland@golang.org>
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>