Resolve "When issues sort by weight, direction change but sort icon doesn't change"

What does this MR do?

This MR resolves the sort-direction indication when sorting issues by weight. The bug fixed here was probably caused as b054a961 changed a method name from issuable_sort_icon_suffix to sort_direction_icon, but did not adopt this change in the EE code (isn't the :override supposed to prevent something like that?) This lead to the special case of sorting by weight being ignored.

Screenshots

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Descending:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers

Closes #37067 (closed)