Fixes #26244: License repository errors should result in different exit codes

[clarktsiory]

https://issues.rudder.io/issues/26244

The main can return an ExitCode, we only have to map it from the result of running the CLI : we intercept the repository errors and associate specific error codes depending on the HTTP error. For now the exit code are 2 and 3.

[clarktsiory]

PR updated with a new commit

[amousset]

👍 for the return code handling and the usage of a custom error type!

This is good on paper, but we will actually almost never reach a 403. The way the authentication code works is by hiding the existence of unauthorized files, due to technical reasons, so the 403 and 404 are mostly indistinguishable.
Additionally, the 403 error very likely means the credentials are valid but the content forbidden, so the error message is not right.
The original code does a pretty bad job at error reporting!

Furthermore, I think the RepositoryError should not expose raw HTTP semantics but rather a "Rudder-level" error and keep the matching private.

Maybe something like:

#[derive(Debug)]
pub enum RepositoryError {
    InvalidCredentials(anyhow::Error),
    Unauthorized(anyhow::Error),
}

While keeping the details in the error itself with something like:

let e = anyhow!("Invalid credentials, please check your credentials in the configuration. (received HTTP {status}");
RepositoryError::InvalidCredentials(e)

let e = anyhow!("Unauthorized dowload from Rudder reporsitory. (received HTTP {status}");
RepositoryError::Unauthorized(e)

[clarktsiory]

PR updated, the changes have been made !
Now there is one error code per enum case (so there are only 2 of them)

[clarktsiory]

PR rebased