feat(storagecontrol): add managed folders samples

[cojenco]

Description

Fixes googleapis/python-storage#1286

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• Tests pass: nox -s py-3.10 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• storagecontrol/managed_folder_create.py:17, tag storage_control_managed_folder_create
• storagecontrol/managed_folder_delete.py:17, tag storage_control_managed_folder_delete
• storagecontrol/managed_folder_get.py:17, tag storage_control_managed_folder_get
• storagecontrol/managed_folder_list.py:17, tag storage_control_managed_folder_list

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