Revert "feat: implement fuzzy search and dropdown grouping in SelectDropdown component"

[cte]

There's a small issue causing a double scrollbar - will fix and re-merge this.

Reverts #2431

---

Important

Reverts fuzzy search and dropdown grouping in SelectDropdown due to UI issue, updating component logic, tests, and i18n files.

• Revert Feature:
  • Reverts fuzzy search and dropdown grouping in SelectDropdown component due to double scrollbar issue.
• Component Changes:
  • Reverts SelectDropdown logic in select-dropdown.tsx to previous state without fuzzy search.
  • Removes Popover components and reverts to DropdownMenu components.
• Test Adjustments:
  • Updates select-dropdown.test.tsx to remove tests related to fuzzy search and dropdown grouping.
  • Reverts mock setup for DropdownMenu components.
• i18n Cleanup:
  • Removes search placeholder strings from multiple locale files.

^{This description was created by for 2854216. It will automatically update as commits are pushed.}

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