fix(core): generate should handle multiselect shorthand

[AgentEnder]

Current Behavior

Some angular devkit schematics use a shorthand for multiselects inside of schema.json that looks something like this:

"propertyName": {
      "type": "array",
      "description": "Specifies which type of guard to create.",
      "items": {
        "enum": ["CanActivate", "CanActivateChild", "CanDeactivate", "CanMatch"],
        "type": "string"
      },
      "default": ["CanActivate"],
      "x-prompt": "Which type of guard would you like to create?"
    }

Currently, this is parsed as a string input

Expected Behavior

This renders a multiselect.

Related Issue(s)

Fixes #19142

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Oct 26, 2023 1:41pm

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• nx affected --targets=lint,test,build --base=12b8d5ea8619b0849238f89b24bf0c27695f5e57 --head=013621abe87ab87b4ee034d54ebfdf9090cd3a73 --parallel=3
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• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=12b8d5ea8619b0849238f89b24bf0c27695f5e57 --head=013621abe87ab87b4ee034d54ebfdf9090cd3a73

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[github-actions]

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