(PC-33299) fix(thematicSearch): limit usage of transformOfferHits

[tprache-pass]

Link to JIRA ticket: https://passculture.atlassian.net/browse/PC-33299

Flakiness

If I had to re-run tests in the CI due to flakiness, I add the incident [on Notion][2]

Checklist

I have:

• Made sure my feature is working on web.
• Made sure my feature is working on mobile (depending on relevance : real or virtual devices)
• Written unit tests native (and web when implementation is different) for my feature.
• Added a screenshot for UI tickets or deleted the screenshot section if no UI change
• If my PR is a bugfix, I add the link of the "résolution de problème sur le bug" [on Notion][1]
• I am aware of all the best practices and respected them.

Screenshots

delete if no UI change

Platform	Mockup/Before	After
iOS

Best Practices

Click to expand

• Remove non-null assertion operators (just like other type assertions, this doesn’t change the runtime behavior of your code, so it’s important to only use ! when you know that the value can’t be null or undefined).

Test specific:

• When you see a local variable that is over-written in every test, mock it.
• Prefer user to fireEvent.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud