[BUG] Two entities for MultiSelectDropdown

[eugenebelov]

Describe the bug
4 components that are doing almost same thing.

Dropdown
SearchableDropdown
MultiSelectInput
MultiselectDropdown from /multiselect-dropdown.tsx
MultiSelectDropdown from /dropdown.tsx <- Pay attention the difference here is in camelCase

We need to do 2 generic components - Select and a Combobox with multiple selection possibilities

Component(s) affected
Which CSPR.design component(s) are involved in this issue? (e.g., CSPR, BodyText, FlexColumn, etc.)
MultiSelectDropdown from dropdown.tsx and MultiselectDropdown from multiselect-dropdown.tsx

To Reproduce
Steps to reproduce the behavior:

1. Import component '...'
2. Use props '...'
3. Render in '...'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Code example
Please provide a minimal code example that reproduces the issue:

// Your code here

Screenshots
If applicable, add screenshots to help explain your problem, especially for visual/styling issues.

Environment information:

• CSPR.design version: 2.0.3

Additional context
Add any other context about the problem here. Include any error messages, console logs, or related issues.

Storybook reference
If the issue is visible in CSPR.design Storybook, please provide a link to the relevant story.

Are you willing to submit a pull request to fix this bug?

• Yes
• No