tests(monitoring): add unit tests for webhook netpol

General MR

Summary

This is a follow-on from the work done in !7048 (merged) that adds unit tests to validate the functionality added there.

Relevant logs/screenshots

❯ helm unittest ./chart -f ./chart/unittests/packages/monitoring/values_test.yaml

### Chart [ bigbang ] ./chart

 PASS  Package - Monitoring - Values    chart/unittests/packages/monitoring/values_test.yaml

Charts:      1 passed, 1 total
Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshot:    0 passed, 0 total
Time:        1.672965138s

Linked Issue

big-bang/product/packages/monitoring#318 (closed)

Upgrade Notices

N/A