TextArea: Allow value null to prevent standard libarary to throw errors

[C3ntraX]

Feature Request Description

See #6472

Standard libarary throwing errors because the textarea value does not accept null.

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[C3ntraX]

The input value does accept null although the api states otherwise, but its was not noticed because the input does not throw an error.
https://sap.github.io/ui5-webcomponents/main/playground/components/Input/

Therefore it makes sense to update the api for the Input Element as well.

[s-todorova]

Hello @SAP/ui5-webcomponents-topic-rl,

This feature request is related to #6472. Could you please check the referenced issue and analyze whether it is espected to be able to set the ui5-textarea value to "null" ?

Kind regards,
Siyana