WIP: [OTE] add webhook tests

[camilamacedo86]

Migrates OLMv1 webhook operator tests from using external YAML files to defining resources in Go structs. This change removes file dependencies, improving test reliability and simplifying test setup.

The migration is a refactoring of code from openshift/origin#30059. The new code uses better naming conventions and adapts the tests to work with a controller-runtime client, enhancing test consistency and maintainability.

The migration covers all core test scenarios:

• Validating, mutating, and conversion webhooks.
• Certificate and secret rotation tolerance.

Assisted-by: Gemini

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@camilamacedo86: 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/openshift-e2e-aws	a29df94	link	true	/test openshift-e2e-aws
ci/prow/e2e-aws-techpreview-olmv1-ext	a29df94	link	true	/test e2e-aws-techpreview-olmv1-ext
ci/prow/okd-scos-e2e-aws-ovn	a29df94	link	false	/test okd-scos-e2e-aws-ovn

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