This change removes a code pattern that I noticed while on a late night
audit of cosmovisor in which
strings.Builder.WriteString(fmt.Sprintf(...))
calls were being made, yet that's counterproductive to using fmt.Fprintf
which will check whether the writer implements .WriteString and then
avoids the need to firstly build a string using fmt.Sprintf.
The performance wins from this change transcend all dimensions as
exhibited below:
```shell
$ benchstat before.txt after.txt
name old time/op new time/op delta
DetailString-8 5.48µs ±23% 4.40µs ±11% -19.79% (p=0.000 n=20+17)
name old alloc/op new alloc/op delta
DetailString-8 2.63kB ± 0% 2.11kB ± 0% -19.76% (p=0.000 n=20+20)
name old allocs/op new allocs/op delta
DetailString-8 63.0 ± 0% 50.0 ± 0% -20.63% (p=0.000 n=20+20)
```
Fixes#13229
abe3e0c6da