test images: Adds OWNERS files for images

Adds reviewers to the OWNERS files in the kubernetes/test/images folder.
The reviewers are added automatically, based on their contributions on
an image (>= 20% code churn).

Note that the code churn is taken into account for authors, and not committers.

Adds OWNERS files for: ipc-utils, node-perf, nonroot, regression-issue-74839,
resource-consumer, sample-device-plugin.

Author: claudiubelu

test/images/nonroot/OWNERS

@@ -0,0 +1,2 @@
+approvers:
+  - tallclair

test/images/regression-issue-74839/OWNERS

@@ -0,0 +1,2 @@
+approvers:
+  - anfernee