💄 Adjust .collapse-truncated-title spacing

What does this MR do and why?

Fix right sidebar whitespace.
Sorry, but I don't know where .milestone-title span is.

I also feel that the vertical spacing of the text in Milestone and Time tracking is bad.
However, since I am not familiar with GitLab, I will avoid making any changes in this MR.

Screenshots or screen recordings

Before	After

How to set up and validate locally

I didn't test locally.
Changed and tested only in Browser by Chrome DevTools.

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