[EventPipe] Streaming events out-of-proc using IPC (#23448)

- There was a race condition on EventPipe::Disable where we deallocated the s_pSession and set it to NULL, but there was still a thread waiting to write and dereference the null pointer. Now, we check that the session is not null.
- Added a new attach event to be handled to the Diagnostic server: Add streaming functionality (Syncronus) #23299
- On Linux, IPC was failing when delete was invoked because we were using new (std::nothrow) instead of new (nothrow) when allocating the newly connected clients/streams. I have replaced the call with new. This fixed #23580
- Move multiFileTraceLengthInSeconds out of the EventPipeSession.
- Unlink previously existing socket.
- EventPipeBlock: _ASSERTE was updated not to fail when data is not aligned if an error has already occurred.
- Update _ASSERTE in fastserializer.cpp to take into account the the write operation could have failed.

1 files changed, 3 insertions, 11 deletions

diff --git a/src/vm/diagnosticserver.h b/src/vm/diagnosticserver.h
index 51f32ae09f..76ad3eff23 100644
--- a/src/vm/diagnosticserver.h
+++ b/src/vm/diagnosticserver.h
@@ -20,17 +20,9 @@ enum class DiagnosticMessageType : uint32_t
     // EventPipe
     EnableEventPipe = 1024,
     DisableEventPipe,
-
-    // TODO: Define what else is available on the out-of-proc interface?
-    // GetSessionInfo,
-    // CreateProvider,
-    // DefineEvent,
-    // GetProvider,
-    // DeleteProvider,
-    // EventActivityIdControl,
-    // WriteEvent,
-    // WriteEventData,
-    // GetNextEvent,
+    StreamEventPipe,
+    AttachEventPipe,
+    DetachEventPipe,
 
     ///////////////////////////////////////////////////////////////////////////
     // Profiler = 2048