Update sample scripts in readmes to remove deprecated methods

[t1m0thyj]

Sample scripts should be updated to stop using methods that were deprecated in #276.

For example, the recommended zos-files SDK method to upload a USS file has changed from Files.upload_file_to_uss to USSFiles.upload.

[github-actions]

Thank you for creating a bug report.
We will investigate the bug and evaluate its impact on the product.
If you haven't already, please ensure you have provided steps to reproduce the bug and as much context as possible.

[zFernand0]

As a follow up, we could also update the following:

• Available commands in: https://github.com/zowe/zowe-client-python-sdk/blob/main/README.md#available-options
• Scripts in: https://github.com/zowe/zowe-client-python-sdk/tree/main/samples
• Restructured text: https://github.com/zowe/zowe-client-python-sdk/blob/main/docs/source/usage/examples.rst
• Individual readme files in: src/*/README.md
  • For example: https://github.com/zowe/zowe-client-python-sdk/blob/main/src/zos_files/README.md