BeginCopyAsync is throwing wrong exception when source blob is not found.

### Which service(blob, file, queue, table) does this issue concern?
Blob (BlobCopier)
### Which version of the Azurite was used?
3.31.0
### Where do you get Azurite? (npm, DockerHub, NuGet, Visual Studio Code Extension)
npm
### What's the Node.js version?
v20.10.0
### What problem was encountered?
The exception thrown when a source blob was not found is "InternalServerError" (500) instead of a "notfound".
### Steps to reproduce the issue?

If possible, please provide the debug log using the -d parameter, replacing \ with an appropriate path for your OS, or review the instructions for docker containers:

```
-d ""
```

Please be sure to remove any PII or sensitive information before sharing!
The debug log will log raw request headers and bodies, so that we can replay these against Azurite using REST and create tests to validate resolution.

### Have you found a mitigation/solution?
No