Madhu Rajagopal

issue 4837 - chore: main.go refactor

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### Proposed changes The objective of this PR is to give test coverage for `main.go` as outlined in [issue 4837](https://github.com/nginxinc/kubernetes-ingress/issues/4837). This includes improving functions by: * returning the error instead...

Issue 4837: chore: main_test.go unit-tests

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This is the first of potentially a few to get testability for `main.go`: * Added unit-tests for the following functions: * `mustCreateConfigClient`, `mustValidateIngressClass`, `mustConfirmMinimumK8sVersionCriteria` * Some of the function names...