fix(test): replace testify with gomega in controller suite (#143)

[MrBeldum]

Summary

Replaces the only direct testify/require call in internal/controller/suite_test.go with a gomega NewWithT(t) assertion and drops github.com/stretchr/testify from go.mod.

Fixes #143

Test plan

• go test ./internal/controller/ -c compiles
• go.mod / go.sum no longer list testify

[coderabbitai]

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[BergCyrill]

Thank you for picking this up @MrBeldum.
There is a blocker for now: This repository requires signed commits on main. We haven't written it down anywhere (but it should be visible in the PR) - that's on us and it will go into a contributing guideline shortly. We will also move to an assigned-issue-contribution approach then.
For now please amend your commit with a valid signing key.

I am also not sure whether the bump of k8s from 0.36 to 0.37 was intentional here - summary & commit message does not reflect that. Please explain to me why you did this in the same PR.

If signing isn't something you are currently able to setup that is no problem at all - just close the PR and the issue can be assigned to someone else.