Use JsonElement.Parse for string-to-JsonElement deserialization

[Copilot]

Replaces JsonSerializer.Deserialize<JsonElement>(string) with JsonElement.Parse(string), the dedicated API introduced in System.Text.Json 10.0.0 for parsing JSON strings into JsonElement.

Changes

• Test servers: Updated InputSchema initialization in TestServer and TestSseServer
• Unit tests: Updated ElicitationTests and ElicitationTypedTests to use JsonElement.Parse
• Documentation: Updated elicitation client sample

Example

- InputSchema = JsonSerializer.Deserialize<JsonElement>("""
+ InputSchema = JsonElement.Parse("""
      {
          "type": "object",
          "properties": { ... }
      }
-     """, McpJsonUtilities.DefaultOptions)
+     """)

Note: JsonElement.Parse doesn't accept JsonSerializerOptions as it only parses the structure, not values.

Original prompt

Find all use of JsonSerializer.Deserialize where it's deserializing from a string into a JsonElement and change it to use JsonElement.Parse, which is new to the 10.0.0 version of System.Text.Json we're now using.

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