Error Logging for extension.ts files for fs.readFile

For `extension.ts` files - we have `fs.readFile` functions that silently fail to not block users.
- We should include error logging (`console.log`, frontend/UI notification to user, etc.)

Original links:
- https://github.com/aws/sagemaker-code-editor/pull/8#discussion_r1504806359
- https://github.com/aws/sagemaker-code-editor/pull/8#discussion_r1504649945

AWS Toolkit error handling: https://github.com/aws/aws-toolkit-vscode/blob/master/packages/core/src/shared/logger/logger.ts