fix: catch not-ok http response codes for sam init

[mndeveci]

Which issue(s) does this change fix?

#7676

Why is this change necessary?

GH is returning 403 for HTTP calls we made to download the manifest file. There is no check at the moment to fallback to cloning the repository.

How does it address the issue?

Checks the response.ok, if it is False it goes through fallback.

What side effects does this change have?

For the customers who faced this issue, listing options for the first time for sam init will be slower since it needs to clone the application templates locally.

Mandatory Checklist

PRs will only be reviewed after checklist is complete

• Add input/output type hints to new functions/methods
• Write design document if needed (Do I need to write a design document?)
• Write/update unit tests
• Write/update integration tests
• Write/update functional tests if needed
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.