Update dotnet test protocol messages

[mariam-abdulla]

This pull request includes several changes to the dotnet-test command in the src/Cli/dotnet/commands/dotnet-test directory. The key changes involve renaming classes and records for better consistency, updating event arguments to include additional properties, and reorganizing some files and serializers.

Renaming for Consistency:

• internal static class HandshakeInfoPropertyNames was renamed to HandshakeMessagePropertyNames in CliConstants.cs.
• HandshakeInfoArgs was renamed to HandshakeArgs and HandshakeInfo property was renamed to Handshake in CustomEventArgs.cs.
• HandshakeInfo record was renamed to HandshakeMessage in HandshakeMessage.cs.
• Module record was renamed to ModuleMessage in ModuleMessage.cs.

Event Arguments Update:

• HelpEventArgs now includes ModulePath and CommandLineOptions properties in CustomEventArgs.cs.
• DiscoveredTestEventArgs now includes ExecutionId and DiscoveredTests properties in CustomEventArgs.cs.
• TestResultEventArgs now includes ExecutionId, SuccessfulTestResults, and FailedTestResults properties in CustomEventArgs.cs.
• FileArtifactEventArgs now includes ExecutionId and FileArtifacts properties in CustomEventArgs.cs.

Records and Serializers:

• CommandLineOptionMessage record no longer implements IRequest in CommandLineOptionMessages.cs.
• DiscoveredTestMessage record was split into DiscoveredTestMessage and DiscoveredTestMessages in DiscoveredTestMessages.cs.
• FileArtifactInfo record was replaced with FileArtifactMessage and FileArtifactMessages in FileArtifactMessages.cs.
• SuccessfulTestResultMessage and FailedTestResultMessage were combined into TestResultMessages in TestResultMessages.cs.

Object Field IDs:

• Updated field IDs and added new ones for DiscoveredTestMessages, TestResultMessages, and FileArtifactMessages in ObjectFieldIds.cs.

Serializers:

• Updated CommandLineOptionMessagesSerializer to fix field count calculation and field naming conventions in CommandLineOptionMessagesSerializer.cs [1] [2].
• Removed DiscoveredTestMessageSerializer and added DiscoveredTestMessagesSerializer in DiscoveredTestMessagesSerializer.cs.