refactor(ui5-select): rework value handling

[ilhan007]

Make "value" fully functional property/attribute and even with higher priority over the selected state of the options.

The Select now will have 2 (competing) APIs for selection, however users will be encouraged to use:

• (1) Either use only the Select's value to determine the selected option
• (2) Оr as prior to this change - using the Options selected state for that.

Enhancements:

• value works both as property and attribute (previously via property only). This is especially a great improvement when binding to the value in React 18 (in React 19 the property setter is used and works even without this change)
• when value is used to select an option, the option wasn't properly selected if it's added with a slight delay caused by app specifics (options are arriving late) or framework specifics (the options aren't slotted/defined when calling the Select's value)

Fixes: #10537 #8174

Example of the improved usage in React

const [selectedValue, setSelectedValue] = useState("banana");

 useEffect(() => {
    setTimeout(() => {
      console.log("Adding options dynamically after delay");
      setOptions(["apple", "banana", "orange", "kiwi"]); // Adding options dynamically after delay
    }, 2000);
  }, []);
  
 <ui5-select ref={selectRef} value={selectedValue}>
        {options.length > 0 ? (
          options.map((opt) => (
            <ui5-option key={opt}>{opt}</ui5-option>
          ))
        ) : (
          <ui5-option>apple</ui5-option>
        )}
</ui5-select>

React18 and React19 - pending selection

• Prior to the change, although the value points to the second option, the first option is selected
  as the options are slotted with delay.

• After the change, the second option is properly selected, pending selections are applied:

React18 - model changes
setSelectedValue("orange");

• Prior to this change, updating the model (bound to value) does not update the Select's selection
• With the change, updating the model (bound to value) changes the Select's selection