Remove obsolete styles definition
What does this MR do and why?
In !102336 (merged), we have removed the remaining usage of the gl-select2-html5-required-fix
CSS class. We can therefore remove its style definition.
Screenshots or screen recordings
No visual change.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #374095 (closed)