test: add tests for `k8sgpt/pkg/analyzer/events.go`

[EshaanAgg]

Fixes part of #889

📑 Description

Adds the tests for events file in the analyzer package

✅ Checks

• [x] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [ ] All the tests have passed

ℹ Additional Information

I am an Open Source enthusiast who is looking forward to taking part in the upcoming LFX Mentorship season for the project as described in issue #889. I have opened this PR as a form of pre-contribution, to showcase that I have the required skills for the project. Hope that stands well with the spirit of the project.

Thanks for your time!