test: add unit tests for CardSearchResultEntity Event and User

[lalmulai]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have run the tests for the backend and frontend depending on what's needed for my changes as described in the testing section of the contributing guide

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Description

Related issue

• Unit tests for CardSearchResultEntity and its variants #1650
• Related to parent issue: Add missing unit tests in frontend #1647

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[github-actions]

Thank you for the pull request! ❤️

The activist team will do our best to address your contribution as soon as we can. If you're not already a member of our public Matrix community, please consider joining! We'd suggest that you use the Element client as well as Element X for a mobile app, and definitely join the General and Development rooms once you're in. Also consider attending our bi-weekly Saturday developer syncs! It'd be great to meet you 😊

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• The TypeScript, pytest and formatting workflows within the PR checks do not indicate new errors in the files changed

• The Playwright end to end and Zap penetration tests have been ran and are passing (if necessary)

• The changelog has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[nicki182]

note: Sorry for the delay but you have some issues @lalmulai with the prettier and eslint issues. It would be great if you can fix them and then we can bring this in.