HDDS-14840 User Experience Improvements on buckets tab.

[arunsarin85]

What changes were proposed in this pull request?

User Experience Improvements on buckets tab.

Please describe your PR in detail:

User Experience Improvements on buckets tab.

Implemented the following improvements on the Buckets Tab of Recon (HDDS-14840):

1. Sticky Bucket and Volume columns — bucketsTable.tsx

Added fixed: 'left' to both the Bucket (name) and Volume (volumeName) column definitions so they remain anchored to the left edge while the user scrolls horizontally through the remaining columns.

2. Search box inside Volumes and Columns dropdowns — multiSelect.tsx

Added an optional showSearch boolean prop (default false) to the shared MultiSelect component. When enabled, a search input is rendered at the top of the dropdown menu, filtering the visible options in real time. Key implementation details:

Options are pre-filtered before being passed to react-select, so filtering works independently of react-select's own input handling.
The dropdown uses controlled menuIsOpen state to stay open while the user interacts with the search box.
A stable InputComponent override suppresses react-select's blur-driven close when focus moves to the search input.
The MenuListComponent is created with useMemo and reads mutable values via a stateRef so its component reference stays stable across re-renders, preventing react-select from unmounting and remounting the menu (which would lose focus mid-typing).
Pressing Escape while the search box is focused closes the dropdown and clears the search term.

3. Select All / Unselect All toggle — multiSelect.tsx

Added an optional showSelectAll boolean prop (default false). When enabled, a checkbox row is rendered below the search box (above the option list) that:

Checks all selectable options when none/some are selected.
Unchecks all options (keeping only the mandatory fixed column, e.g. "Bucket") when all are already selected.
onMouseDown on this row prevents blur from firing on the react-select control, so the menu stays open after clicking.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-14840

How was this patch tested?

Sticky Vol/Buck

Select unselect & search