.Net: Handlebars prompt template doesn't deserialize JSON response when `Content-Type` includes `charset`

**Describe the bug**
If the `Content-Type` header of a REST API JSON response includes a `charset` (e.g. `Content-Type: application/json; charset=utf-8`), the Handlebars prompt template handles the response as a string instead of as deserialized JSON.  

**To Reproduce**
The issue appears to be due to how the `Content-Type` is matched here:

https://github.com/microsoft/semantic-kernel/blob/fe29d1abba770914878b428f9b52c1f1f6ee7861/dotnet/src/Extensions/PromptTemplates.Handlebars/Helpers/KernelHelpers/KernelFunctionHelpers.cs#L211-L221

**Expected behavior**
The JSON response should be deserialized.

**Platform**
 - Language: C#
 - Source: `Microsoft.SemanticKernel.PromptTemplates.Handlebars` version `1.4.0`

	if (resultAsObject is RestApiOperationResponse restApiOperationResponse)
	{
	// Deserialize any JSON content or return the content as a string
	if (string.Equals(restApiOperationResponse.ContentType, "application/json", StringComparison.OrdinalIgnoreCase))
	{
	var parsedJson = JsonValue.Parse(restApiOperationResponse.Content.ToString());
	return KernelHelpersUtils.DeserializeJsonNode(parsedJson);
	}

	return restApiOperationResponse.Content;
	}

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.Net: Handlebars prompt template doesn't deserialize JSON response when `Content-Type` includes `charset` #5127

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.Net: Handlebars prompt template doesn't deserialize JSON response when Content-Type includes charset #5127

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.Net: Handlebars prompt template doesn't deserialize JSON response when `Content-Type` includes `charset` #5127