feat(remotek6):Add remote test scripts

[bearrito]

What does this PR do?

Adds support for remote test scripts

Why is it important?

Addressing https://github.com/testcontainers/testcontainers-go/issues/2246

How to test this PR

Run the unit tests.

I'm dogfooding the existing scripts from within the git repo iteself. I think this is a good idea because we will know the existing scripts pass/fail, then if they change it will be automatically reflected in the remote tests.

I don't have a server setup with basic auth for me to test the auth portion.

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[mdelapenya]

In #2401 we added support for a io.Reader in the ContainerFile struct. I think we could leverage it in this module, changing the internals of the WithTestScript function to get the reader. We could have a WithTestScriptReader function that receives the reader, and that reader is passed to the request's files. Finally, I'd change the existing option to invoke the reader with the file reader.

Wdyt?

[bearrito]

@mdelapenya No problem, I can do that.

[bearrito]

Updated to use reader API

[bearrito]

@mdelapenya I think I addressed all your comments.