Add event_tracer to MIL for Backend Init Context (#11105)

Summary:
Pull Request resolved: #11105

Allow for intended usage of event tracer in BackendInitContext.

Reviewed By: cccclai

Differential Revision: D75308778

Author: Chris Thompson

.github/workflows/pull.yml

@@ -406,7 +406,7 @@ jobs:
         output=$(ls -la cmake-out/test/size_test)
         arr=($output)
         size=${arr[4]}
-        threshold="47560"
+        threshold="53000"
         if [[ "$size" -le "$threshold" ]]; then
           echo "Success $size <= $threshold"
         else

runtime/backend/backend_init_context.h

@@ -25,6 +25,7 @@ class BackendInitContext final {
       const char* method_name = nullptr,
       const NamedDataMap* named_data_map = nullptr)
       : runtime_allocator_(runtime_allocator),
+        event_tracer_(event_tracer),
         method_name_(method_name),
         named_data_map_(named_data_map) {}