[Bug]: Improve Logging for validation failure in HotReload

### What happened?

For many scenarios, validation failure messages are not useful This needs to be improved.
for example:
1. using invalid connection string.
2. using an incorrect source for entity.

All the above just give a generic message showing: `Unable to hot reload configuration file due to One or more errors occurred.`
This message is not very useful in debugging.

### Version

1.3.13-rc

### What database are you using?

Azure SQL

### What hosting model are you using?

Local (including CLI)

### Which API approach are you accessing DAB through?

_No response_

### Relevant log output

```Text

```

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct