chore: Replace deprecated ioutil.ReadFile and ioutil.ReadDir in workspaceenv_test

[rohanKanojia]

What does this PR do?

Updated code to use os.ReadFile and os.ReadDir, as ioutil package was deprecated in Go 1.16 (See ioutil godoc).

Deprecated: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code.

What issues does this PR fix or reference?

This is just a minor code smell fix, it is not related to any issue.

Is it tested? How?

I've only verified it via IDE that code is not breaking any build.

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[openshift-ci]

Hi @rohanKanojia. Thanks for your PR.

I'm waiting for a devfile member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[rohanKanojia]

/ok-to-test

[akurinnoy]

/retest

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, rohanKanojia
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