feat: remove unnecessary files & logics in playground

[mikasackermn]

Summary

We had unnecessary files and logic in the Playground that had to be removed

How did you test this change?

Run Playground

Checklist:

• I have performed a self-review of my code

[samobasquiat]

I saw some errors or files that have not been resolved (removed):

• import type { MapSupportedList } from './MultiList.types'; in widget/playground/src/components/MultiList/MultiList.helper.ts
• widget/playground/src/components/MultiSelect/MultiTokenSelect.tsx
• widget/playground/src/components/MultiSelect/index.tsx
• widget/playground/src/components/MultiSelect/Container.tsx
• SearchParams in widget/playground/src/constants/index.ts
• // import { LiquiditiesSection } from './FunctionalLayout.Liquidities';
• Do we still need /* eslint-disable @typescript-eslint/no-magic-numbers */ ? I didn't see any number in that file.
• After removing multi-select I think we can remove containsText & filterTokens as well
• Can you check package json file as well?

[RanGojo]

It seems good to me. @mikasackermn Please syn with the next so I will perform a final test.