Sample migration PR: test-20260323T070124

[jskeet]

As with #16131, the last commit is the interesting one (and should be smaller now).

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• packages/google-cloud-ces/samples/generated_samples/ces_v1beta_generated_session_service_stream_run_session_async.py:26, tag ces_v1beta_generated_SessionService_StreamRunSession_async
• packages/google-cloud-ces/samples/generated_samples/ces_v1beta_generated_session_service_stream_run_session_sync.py:26, tag ces_v1beta_generated_SessionService_StreamRunSession_sync
• packages/google-shopping-merchant-accounts/samples/generated_samples/merchantapi_v1_generated_accounts_service_create_test_account_async.py:26, tag merchantapi_v1_generated_AccountsService_CreateTestAccount_async
• packages/google-shopping-merchant-accounts/samples/generated_samples/merchantapi_v1_generated_accounts_service_create_test_account_sync.py:26, tag merchantapi_v1_generated_AccountsService_CreateTestAccount_sync

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