[BUG] listKeys function is not supported

### Describe the bug

A user reported getting this warning in their output:

```
Warning: An exception occurred while evaluating the properties of a resource. Properties: "CacheConnection": "[concat(variables('cacheName'),'.redis.cache.windows.net,abortConnect=false,ssl=true,password=', listKeys(resourceId('Microsoft.Cache/Redis', variables('cacheName')), '2020-12-01').primaryKey)]"
Exception details:
Azure.Deployments.Core.Exceptions.ExpressionException: The language expression property 'primaryKey' can't be evaluated.
at Azure.Deployments.Expression.Expressions.FunctionExpression.SelectProperty(JToken root, JToken property, TemplateErrorAdditionalInfo additionalInfo)
at Azure.Deployments.Expression.Expressions.FunctionExpression.EvaluateExpression(ExpressionEvaluationContext context, TemplateErrorAdditionalInfo additionalInfo)
at Azure.Deployments.Expression.Expressions.FunctionExpression.<>c__DisplayClass23_0.b__0(LanguageExpression parameter)
at System.Array.ConvertAll[TInput,TOutput](TInput[] array, Converter`2 converter)
at Microsoft.WindowsAzure.ResourceStack.Common.Extensions.IEnumerableExtensions.SelectArray[TSource,TElement](TSource[] source, Converter`2 elementSelector)
at Azure.Deployments.Expression.Expressions.FunctionExpression.EvaluateParameters(ExpressionEvaluationContext context, TemplateErrorAdditionalInfo additionalInfo)
at Azure.Deployments.Expression.Expressions.FunctionExpression.EvaluateExpression(ExpressionEvaluationContext context, TemplateErrorAdditionalInfo additionalInfo)
at Azure.Deployments.Expression.Engines.ExpressionsEngine.EvaluateLanguageExpressionsInternal(JToken root, ExpressionEvaluationContext evaluationContext, Boolean ignoreExceptions, TemplateErrorAdditionalInfo additionalInfo, InsensitiveHashSet skipEvaluationPaths)
at Azure.Deployments.Expression.Engines.ExpressionsEngine.EvaluateLanguageExpressionsRecursive(JToken root, ExpressionEvaluationContext evaluationContext, TemplateErrorAdditionalInfo additionalInfo, InsensitiveHashSet skipEvaluationPaths)
at Microsoft.Azure.Templates.Analyzer.TemplateProcessor.ArmTemplateProcessor.ProcessTemplateResourceLanguageExpressions(TemplateResource templateResource, TemplateExpressionEvaluationHelper evaluationHelper) in C:\Users\wilbug1\source\repos\template-analyzer\src\Analyzer.TemplateProcessor\ArmTemplateProcessor.cs:line 390
```

### Expected behavior

Template properties that use the `listKeys` function should be processed

### Reproduction Steps

Analyze a template that uses the `listKeys` function

### Environment

_No response_