Migrate away from deprecated ioutil

[sebrandon1]

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

• Modernized file reading by switching from ioutil.ReadFile to os.ReadFile in pkg/controller/config.go, aligning with current Go best practices. [1] [2]

[openshift-ci]

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[openshift-ci]

@sebrandon1: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws	a87988a	link	true	/test e2e-aws
ci/prow/e2e-aws-capi-techpreview	a87988a	link	true	/test e2e-aws-capi-techpreview
ci/prow/e2e-upgrade	a87988a	link	true	/test e2e-upgrade
ci/prow/e2e-aws-operator	a87988a	link	true	/test e2e-aws-operator

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