Redesign CreatedByFilter component and add hideFilters prop to RunSection

[Mbeaulne]

Description

Redesigned the CreatedByFilter component to be a simpler, more focused text input with improved UX. The new implementation removes the toggle switch in favour of a cleaner search input with an icon and clear button. This change supports the new filter bar UI by allowing the RunSection component to hide its built-in filters when the new filter bar is enabled.

Type of Change

• Improvement
• Cleanup/Refactor

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Test Instructions

1. Navigate to the home page to see the updated user filter in the new filter bar
2. Test typing in the user filter and verify it updates results
3. Test clearing the filter using the X button
4. Verify that the old filters are hidden when the new filter bar is enabled

[Mbeaulne]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add filter badge key to active filters badge #1779
• Redesign CreatedByFilter component and add hideFilters prop to RunSection #1733 👈 (View in Graphite)
• Hook up filters to API where availiable #1712
• Add BetaFeatureWrapper and pipeline run filters bar UI #1711
• Filter Bar #1708 : 1 other dependent PR (#1709 )
• Add created by me filter #1713
• Status filter #1707
• Annotation Filter input #1706
• Date picker #1705
• Add pipeline run filters bar with search functionality #1734
• Add useRunSearchParams hook for pipeline run filtering #1704
• master

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