Fix incorrect conversion between int types

[viveksinghggits]

Change Overview

Fixes #3202

In the older version of the logic where we were reading replicas of workload in ScaleWorkload function; if val (string type) has an int value that is beyond the range of int32, even though call strconv.Atoi(val) would succeed, the next of replicas = int32(v) would result into unexpected result because the val is beyond what can be accommodated into int32 type.
This change fixes that.

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test
• 🏗️ Build

Issues

• fixes Fix code scanning alert - Incorrect conversion between integer types #3202

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

/kanister/pkg/function (fix-codescanning-incorrect-intconv*) » go test -check.f "ScaleWorkloadSuite"
OK: 1 passed
PASS
ok      github.com/kanisterio/kanister/pkg/function     0.894s

[pavannd1]

This file needs the license header

[viveksinghggits]

I will make sure that I add this as part of one of the next PRs.