docs: removes deprecated sample

[chalmerlowe]

Part 2 of a series of PRs to remove and replace a deprecated sample:

removes the code that demos schedule_transfer_run()
That code was replaced with code that demos start_manual_transfer_runs() in the following PR: #448

Fixes internal bug: #191232835

[snippet-bot]

You are about to delete the following sample browser pages.

• samples/snippets/manage_transfer_configs.py:151, tag bigquerydatatransfer_start_manual_transfer(usage: page 1).
• samples/snippets/manage_transfer_configs.py:170, tag bigquerydatatransfer_start_manual_transfer(usage: page 1).

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Here is the summary of changes.

You are about to add 2 region tags.

• samples/snippets/manage_transfer_configs.py:109, tag bigquerydatatransfer_schedule_backfill
• samples/snippets/manage_transfer_configs.py:128, tag bigquerydatatransfer_schedule_backfill

You are about to delete 4 region tags.

• samples/snippets/manage_transfer_configs.py:109, tag bigquerydatatransfer_schedule_backfill
• samples/snippets/manage_transfer_configs.py:123, tag bigquerydatatransfer_schedule_backfill
• samples/snippets/manage_transfer_configs.py:151, tag bigquerydatatransfer_start_manual_transfer
• samples/snippets/manage_transfer_configs.py:170, tag bigquerydatatransfer_start_manual_transfer

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