chore: update transfer manager sample region tags

[andrewsg]

Updates region tags for Transfer Manager samples to bring them in line with planned documentation.

The region tags for sample "downloadFolderWithTransferManager.js" is also renamed here for consistency, but as a separate work item should be changed to a download bucket sample at a later time.

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• samples/downloadFileInChunksWithTransferManager.js:32, tag storage_transfer_manager_download_chunks_concurrently
• samples/downloadFolderWithTransferManager.js:24, tag storage_transfer_manager_download_folder
• samples/downloadManyFilesWithTransferManager.js:28, tag storage_transfer_manager_download_many
• samples/uploadDirectoryWithTransferManager.js:24, tag storage_transfer_manager_upload_directory
• samples/uploadManyFilesWithTransferManager.js:28, tag storage_transfer_manager_upload_many

You are about to delete 5 region tags.

• samples/downloadFileInChunksWithTransferManager.js:32, tag storage_download_many_files_transfer_manager
• samples/downloadFolderWithTransferManager.js:24, tag storage_download_folder_transfer_manager
• samples/downloadManyFilesWithTransferManager.js:28, tag storage_download_many_files_transfer_manager
• samples/uploadDirectoryWithTransferManager.js:24, tag storage_upload_directory_transfer_manager
• samples/uploadManyFilesWithTransferManager.js:28, tag storage_upload_many_files_transfer_manager

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