Fix trigger for onSelect when multiple is true and typeahead is false

[SehgalShaileen]

Issue:
When using the p-autocomplete component with multiple: true and typeahead: false, the onSelect event is not triggered when a new item is added manually. [(https://stackblitz.com/edit/github-r87asf7e-ppy2ke4s)]

Issue : #18099

Steps to Reproduce:

1. Set up p-autocomplete with multiple: true and typeahead: false.
2. Manually add a value in the input field.
3. The onSelect event is not triggered.

Expected Behavior:
The onSelect event should be triggered when a new item is added manually.

Actual Behavior:
The onSelect event is not triggered when manually adding a value.

Fix:
The issue was fixed by calling onSelect explicitly in the onEnterKey method when multiple: true and typeahead: false.

[vercel]

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