Added primitive data type check in cleanValue util function

[mnpreetkaur]

Closes #3048

[mnpreetkaur]

Added the empty string condition as on selecting an empty string Select box should reset to default placeholder.

[ebonow]

Case for PR:
When using an array of options that are of type String or Number and using getOptionValue and getOptionLabel, the result of the onChange value returns no value.

Since the select can render these options and that this is not an issue when isMulti, it should be expected that the value should be the same value as the selected option when isMulti is false.

Case against PR:
#4058 (comment)

Nice work. The bad news is I don't think the collaborator would accept this change after I checked the early related issues and PR.

• Find correct option when value is passed as a string Find correct option when value is passed as a string #3050
• Allow passing of primitive values as value prop Allow passing of primitive values as value prop #2908
• simple value in upgrade guide https://react-select.netlify.app/upgrade-guide#simple-value
• some explanations [V2] Setting initial value of select component with a string value no longer works #2669 (comment) >[V2] Setting initial value of select component with a string value no longer works #2669 (comment) Allow passing of primitive values as value prop #2908 (comment)
• a wrapper for this case was created. https://github.com/jossmac/react-select-simple-value