BUG: fixes overflow issue of issue title in activity

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What does this MR do and why?

fixes #538932 (closed)

This PR changes overflow wrapping style to event title

Screenshots or screen recordings

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Example:

1. Create a new issue with a text that has a ~200 character word (no whitespace)
2. Go to your activity page https://gitlab.com/users/{username}/activity and check overflow issue

MR acceptance checklist

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