[Epic] Improve test suite — add unit tests for helper functions

[R-Lawton]

Summary

The developer portal controller currently has solid integration tests (envtest) and E2E tests (Kind cluster), but all ~100 test cases require a running API server. This epic tracks adding lightweight unit tests for pure helper functions that don't need envtest or Kind — faster feedback, easier to debug.

Motivation

• Every test currently requires envtest or Kind — no fast, isolated tests exist
• Many helper functions are pure (no k8s client, no I/O) and can be tested with simple input/output assertions
• Pure unit tests run in milliseconds vs seconds for envtest, giving faster feedback during development
• Status condition logic and name generation functions are critical paths worth testing in isolation

Review & Verification

PRs should include:

• How to review the changes (areas of interest, suggested review order)
• Steps to confirm locally: make test runs and passes