Design Improvements[UTs]: Restructure and re-use helper functions

[cmallikarjunah]

Design Improvements Description

We need to create a shared way across kubebuilder/pkg/ unittests and e2e tests to reuse functionality of creating/using binaries and temporary directory. That way we re-use the same code across files and reduce the overhead of modifying multiple areas from the maintenance perspective. Thus, also improving readability and structure.

Existing helper for binary creation:
https://github.com/kubernetes-sigs/kubebuilder/blob/869ca6b65027baa71f4d5410f68f7830c1c90857/test/e2e/utils/test_context.go#L64C1-L117C2

Existing helper for cleaning up dir: https://github.com/kubernetes-sigs/kubebuilder/blob/master/test/e2e/utils/test_context.go#L251-L270

Example Usage: https://github.com/kubernetes-sigs/kubebuilder/blob/869ca6b65027baa71f4d5410f68f7830c1c90857/test/e2e/v4/e2e_suite_test.go#L40-L43

What do we need

1. We need something like test/context.go in our repo where the helpers can be placed.
2. kubebuilder/pkg/ unit tests to use the contexts.
3. Identify similar adjustments and add it to test/ and make sure we re-use code as much as possible for testing.

[cmallikarjunah]

/kind enhancement

/assign

[k8s-ci-robot]

@cmallikarjunah: The label(s) kind/enhancement cannot be applied, because the repository doesn't have them.

In response to this:

/kind enhancement

/assign

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