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

Migration from ioutil to os for file and directory operations:

• Replaced ioutil.ReadFile with os.ReadFile and ioutil.ReadDir with os.ReadDir in core configuration and bundle loading logic, such as in pkg/profiling/config/config.go and staging/api/pkg/manifests/bundleloader.go. [1] [2] [3] [4]

• Updated validation and testing files to use os.ReadFile instead of ioutil.ReadFile, including files like staging/api/pkg/validation/internal/community.go, crd_test.go, csv_test.go, object_test.go, and operatorgroup_test.go. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

• Updated additional internal and registry logic to use os.ReadFile, os.WriteFile, and os.MkdirTemp in place of their ioutil counterparts, such as in operatorhub.go, buildahregistry/_options.go, and provisioner_kind.go. [1] [2] [3] [4] [5] [6]

[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/verify	a4ca444	link	true	/test verify
ci/prow/e2e-gcp-console-olm	a4ca444	link	true	/test e2e-gcp-console-olm
ci/prow/verify-deps	a4ca444	link	true	/test verify-deps

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