chore: update make test target to only run where _test files exist

[jaideepr97]

currently there is a go version mismatch between what is in the go.mod file (1.25.8) and what the CI job uses (1.24) which might be causing a dynamic download of 1.25.8 in the CI, which doesn't include the covdata tool
Hence we are currently seeing an error in CI when make test runs against folders that don't contain any _test files

Setting up envtest binaries for Kubernetes version 1.35...
/home/prow/go/src/github.com/kubernetes-sigs/mcp-lifecycle-operator/bin/k8s/1.35.0-linux-amd64KUBEBUILDER_ASSETS="/home/prow/go/src/github.com/kubernetes-sigs/mcp-lifecycle-operator/bin/k8s/1.35.0-linux-amd64" go test $(go list ./... | grep -v /e2e) -coverprofile cover.out
ok  	github.com/kubernetes-sigs/mcp-lifecycle-operator/api/v1alpha1	13.481s	coverage: 0.7% of statements
# github.com/kubernetes-sigs/mcp-lifecycle-operator/cmd
go: no such tool "covdata"
# github.com/kubernetes-sigs/mcp-lifecycle-operator/test/utils
go: no such tool "covdata"
ok  	github.com/kubernetes-sigs/mcp-lifecycle-operator/internal/controller	10.688s	coverage: 78.7% of statements
make: *** [Makefile:65: test] Error 1

as we can see, the actual tests run fine, it only fails on folders that don't contain any test files
This PR updates the make target so that it skips those folders

A separate PR has been raised to update the CI image to 1.25 - kubernetes/test-infra#36688

[k8s-ci-robot]

Hi @jaideepr97. Thanks for your PR.

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[matzew]

/ok-to-test

[matzew]

/lgtm
/approve

Thanks for looking into this!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jaideepr97, matzew

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