[4.0] Replace 25% & 50% width inline styles with respective classes

[Quy]

Redo of #27344 to fix conflicts and do incremental PRs for easy testing.

Thanks @chang-zhao for the initial PR.

Summary of Changes

Replace width inline styles with classes.

w-25 and w-50 are Bootstrap sizing classes so no need to create these classes.

Testing Instructions

Code review.
or
Log in to administration.
No visual changes in the following:
See Logged-in Users module.
See System > System Information > System Information tab

[ciar4n]

What is the benefit of replacing style width with classes?

[Quy]

To address CSP. See #27297.

[richard67]

@Quy I think on your description you meant „... no need to create these classes“, but the “no” is missing.

[Quy]

Fixed. Thanks.

[jwaisner]

I have tested this item ✅ successfully on 9fa541f

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[ChristineWk]

I have tested this item ✅ successfully on 9fa541f

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[Quy]

RTC

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[HLeithner]

Thanks