Tag doesn't show icon when slot is used instead of "value" attribute

[sid-6581]

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Current behavior
When specifying an icon for Tag using the icon attribute and using the slot for the text instead of the value attribute, the icon is not shown.

Expected behavior
The icon should be shown whether the value attribute or the slot is used.

What is the motivation / use case for changing the behavior?
It's often much more convenient to use the slot than the attribute, since the tag is often used for information that is assembled from multiple parts. For instance, a warning tag with the text "X of Y items completed" would be more easily expressed with <Tag severity="warning" icon="pi pi-exclamation-triangle">{{ X }} of {{ Y }} completed</Tag> than using an interpolated string in the value attribute.

Please tell us about your environment:

• Vue version: 3.2.26

• PrimeVue version: 3.10

• Browser: all