fix(Dataform)!: remove obsolete LRO forwarding methods and formatting

[sofisl]

This PR removes obsolete LRO forwarding methods from DataformClient and their corresponding samples, along with some formatting fixes generated by gapic-generator-php.

Testing Deletions

I attempted to call one of the deleted methods to prove it no longer exists on the client.

Test Script:

<?php
require 'vendor/autoload.php';
use Google\Cloud\Dataform\V1\Client\DataformClient;
use Google\LongRunning\CancelOperationRequest;

$client = new DataformClient();
echo "Testing deleted cancelOperation method on DataformClient...\n";
try {
    $client->cancelOperation(new CancelOperationRequest());
} catch (\Throwable $e) {
    echo "Error: " . $e->getMessage() . "\n";
}

Output:

Testing deleted cancelOperation method on DataformClient...
Error: Call to undefined method Google\Cloud\Dataform\V1\Client\DataformClient::cancelOperation()

BREAKING_CHANGE_REASON=In gapic-generator-php PR #834, the legacy V1 surface generation logic was removed. Previously, LRO methods like cancelOperation were erroneously forwarded on the main client class if google.longrunning.Operations was included as a mixin. The removal of the V1 surface stopped the generation of these methods, but OwlBot failed to delete them from google-cloud-php. Librarian correctly removes these obsolete wrappers. This is a true breaking change in the client's API surface; users who were calling $client->cancelOperation() must now migrate their code to call $client->getOperationsClient()->cancelOperation() (and it is currently still working).

Fixes googleapis/librarian#7369

[snippet-bot]

Here is the summary of changes.

You are about to delete 8 region tags.

• Dataform/samples/V1/DataformClient/cancel_operation.php:25, tag dataform_v1_generated_Dataform_CancelOperation_sync
• Dataform/samples/V1/DataformClient/delete_operation.php:25, tag dataform_v1_generated_Dataform_DeleteOperation_sync
• Dataform/samples/V1/DataformClient/get_operation.php:25, tag dataform_v1_generated_Dataform_GetOperation_sync
• Dataform/samples/V1/DataformClient/list_operations.php:25, tag dataform_v1_generated_Dataform_ListOperations_sync
• Dataform/samples/V1beta1/DataformClient/cancel_operation.php:25, tag dataform_v1beta1_generated_Dataform_CancelOperation_sync
• Dataform/samples/V1beta1/DataformClient/delete_operation.php:25, tag dataform_v1beta1_generated_Dataform_DeleteOperation_sync
• Dataform/samples/V1beta1/DataformClient/get_operation.php:25, tag dataform_v1beta1_generated_Dataform_GetOperation_sync
• Dataform/samples/V1beta1/DataformClient/list_operations.php:25, tag dataform_v1beta1_generated_Dataform_ListOperations_sync

---

This comment is generated by snippet-bot.
If you find problems with this result, please file an issue at:
https://github.com/googleapis/repo-automation-bots/issues.
To update this comment, add snippet-bot:force-run label or use the checkbox below:

• Refresh this comment