fix(core): add continuous to the project.json schema (#30853)

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## Current Behavior
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The `project.json` schema is missing `continuous`.

## Expected Behavior
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The `project.json` schema has `continuous` defined.

## Related Issue(s)
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merged. -->

Fixes #

packages/nx/schemas/project-schema.json

@@ -138,6 +138,11 @@
             "type": "boolean",
             "description": "Specifies if the given target should be cacheable"
           },
+          "continuous": {
+            "type": "boolean",
+            "default": false,
+            "description": "Whether this target runs continuously until stopped"
+          },
           "parallelism": {
             "type": "boolean",
             "default": true,