Fix a missing entry for intenseTextStyle in the Profile schema (#14210)

Fix a missing entry in the JSON schema for `intenseTextStyle`.

The JSON schema was missing an entry in the Profile section for
`intenseTextStyle`. I have added it as it appears in AppearanceConfig.
Note that this is currently duplicated in the schema -- however, this is
the pattern used already in Profile as AppearanceConfig entries have
alternate descriptions (and I have updated the description in that
section to make it clear it applies to unfocused terminals).
Longer-term, it likely makes sense to consolidate all entires into
ApperanceConfig and rely on the description for the `unfocusedApperance`
object/the name of the object to make the limited scope of those keys
clear, so that Profile can simply extend ApperanceConfig and the
duplication in the schema can be reduced.

## Validation Steps Performed
Validation with schema verifying tools including VS Code.

Partially addresses #13387

doc/cascadia/profiles.schema.json

@@ -203,7 +203,7 @@
         },
         "intenseTextStyle": {
           "default": "bright",
-          "description": "Controls how 'intense' text is rendered. Values are \"bold\", \"bright\", \"all\" and \"none\"",
+          "description": "Controls how 'intense' text is rendered when unfocused. Values are \"bold\", \"bright\", \"all\" and \"none\"",
           "enum": [
             "none",
             "bold",
@@ -2283,6 +2283,17 @@
           ],
           "deprecated": true
         },
+        "intenseTextStyle": {
+          "default": "bright",
+          "description": "Controls how 'intense' text is rendered. Values are \"bold\", \"bright\", \"all\" and \"none\"",
+          "enum": [
+            "none",
+            "bold",
+            "bright",
+            "all"
+          ],
+          "type": "string"
+        },
         "foreground": {
           "$ref": "#/$defs/Color",
           "default": "#cccccc",