Cleanup and Ignore AWS SAM Build Artifacts

AWS SAM best practices recommend not committing build artifacts to the repository.
This commit removes the build.toml file from the AWS Operations Agent sample
and adds .aws-sam directories to the .gitignore file to prevent future commits
of these artifacts.

Author: CoreyLivingston

.gitignore

@@ -208,4 +208,7 @@ __marimo__/
 # Streamlit
 .streamlit/secrets.toml
 cp/*
-wheelhouse/*
+wheelhouse/*
+
+# AWS SAM build artifacts
+**/.aws-sam/