refactor: replace custom slice Contains method with slices.Contains

[rohanKanojia]

Description

Replaced the custom implementation of the slice Contains method with built-in slices.Contains function from the Go standard library.

This simplifies the code and improves readability and maintainability.

Relates to: PR #4591 (comment)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Proposed changes

• Remove crcstrings.Contains method from crcstrings package
• Use slices.Contains function from the Go standard library in removed method's place.

Testing

I've just verified that project is building and all tests are passing.

Contribution Checklist

• I Keep It Small and Simple: The smaller the PR is, the easier it is to review and have it merged
• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Which platform have you tested the code changes on?
  • Linux
  • Windows
  • MacOS

[cfergeau]

This even catches some situation where Contains was reimplemented manually, nice!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfergeau

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[openshift-ci]

@rohanKanojia: 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/security	a8b03c7	link	false	/test security
ci/prow/e2e-crc	a8b03c7	link	true	/test e2e-crc

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