Can't send message with type ChatMessageType.ParticipantAdded

[ranouf]

Library name and version

Azure.Communication.Chat 1.1.1

Describe the bug

Same as this bug:
#32623

I create a new ChatThread
```
public async Task CreateChatThreadAsync(string topic, IDictionary<string, string> participants, string accessToken)
{
var client = GetChatClient(accessToken);

        var response = await client.CreateChatThreadAsync(
            topic,
            participants.Select(participant =>
                new ChatParticipant(
                    CommunicationIdentifier.FromRawId(participant.Key)
                )
                {
                    DisplayName = participant.Value
                }
            )
        );
        var result = response.Value.ChatThread.Id;
        return result;
    }

        
        
        then I try to send a message (like propose in the sample there: https://github.com/microsoft/BotFramework-WebChat/tree/master/samples/04.api/a.welcome-event)
        ```

                public async Task<string> SendNewParticipantAddedAsync(
            string accessToken,
            string threadId
        )
        {
            var client = GetChatClient(accessToken);
            var chatThreadClient = client.GetChatThreadClient(threadId);

            var response = await chatThreadClient.SendMessageAsync(
                @"{
                    name: 'webchat/join',
                    value: {  }
                }",
                ChatMessageType.ParticipantAdded
            );
            var result = response.Value.Id;
            return result;
        }

Then i have this issue:

An error occurred while writing to logger(s). (Input string was not in a correct format.) (Input string was not in a correct format.) (Input string was not in a correct format.)'

FormatException: Input string was not in a correct format.

Expected behavior

it should not throw an exception and the message should be sent as expected

Actual behavior

i have this issue:

An error occurred while writing to logger(s). (Input string was not in a correct format.) (Input string was not in a correct format.) (Input string was not in a correct format.)'

FormatException: Input string was not in a correct format.

Reproduction Steps

I create a new ChatThread
```
public async Task CreateChatThreadAsync(string topic, IDictionary<string, string> participants, string accessToken)
{
var client = GetChatClient(accessToken);

        var response = await client.CreateChatThreadAsync(
            topic,
            participants.Select(participant =>
                new ChatParticipant(
                    CommunicationIdentifier.FromRawId(participant.Key)
                )
                {
                    DisplayName = participant.Value
                }
            )
        );
        var result = response.Value.ChatThread.Id;
        return result;
    }

        
        
        then I try to send a message (like propose in the sample there: https://github.com/microsoft/BotFramework-WebChat/tree/master/samples/04.api/a.welcome-event)
        ```

                public async Task<string> SendNewParticipantAddedAsync(
            string accessToken,
            string threadId
        )
        {
            var client = GetChatClient(accessToken);
            var chatThreadClient = client.GetChatThreadClient(threadId);

            var response = await chatThreadClient.SendMessageAsync(
                @"{
                    name: 'webchat/join',
                    value: {  }
                }",
                ChatMessageType.ParticipantAdded
            );
            var result = response.Value.Id;
            return result;
        }

Environment

.net 6.0

	<PackageReference Include="Azure.Communication.Chat" Version="1.1.1" />
	<PackageReference Include="Azure.Communication.Identity" Version="1.2.0" />