Fix perfsprint linter errors

[mukundansundar]

Describe the proposal

For now //nolint: perfsprint has been added in some files in CLI.

Make changes in CLI to convert the fmt.Sprintf("%d)...) into strconv.Itoa and handle associated errors as well.

Release Note

RELEASE NOTE:

[sp6370]

@mukundansundar I would like to pick this up.

[sp6370]

/assign

[KentHsu]

/assign