Use GitLab UI Utility Classes in Merge Request Title Partial

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The following discussions from !61605 (merged) should be addressed:

@sming-gitlab started a discussion:

nitpick: would this be a good opportunity to use our gl util classes?

gl-pt-0 and gl-pb-0
@sming-gitlab started a discussion:
nitpick: same thoughts as above, maybe an opportunity to use our gl util classes 😁
```
gl-float-left
```
@sming-gitlab started a discussion:
nitpick: same thoughts as above, maybe an opportunity to use our gl util classes 😁
```
gl-display-none
gl-md-display-block (👈 this should be double checked 🤔)
```
@sming-gitlab started a discussion:
nitpick: same thoughts as above, maybe an opportunity to use our gl util classes 😁
```
gl-float-right
gl-display-block
gl-sm-display-none (👈 this should be double checked 🤔)
```

Edited Sep 22, 2025 by 🤖 GitLab Bot 🤖