fix: update cert effect on cert page

[sebastiendan]

Description

This PR fixes the Certificate page by having the effect that checks whether the cert's subnet is the selected subnet triggered on new subnet selection.

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works