chore(GkeConnectGateway): remove obsolete wildcard HTTP sample files

[sofisl]

This PR removes obsolete sample files for GkeConnectGateway that are no longer generated.

Testing Deletions

No core library classes were deleted in this PR, only orphaned sample files for GatewayServiceClient. The core GatewayServiceClient was deleted in a prior PR, but its corresponding samples were mistakenly left behind.

Test Script:

<?php
require 'vendor/autoload.php';
echo "Testing client existence...\n";
if (class_exists('Google\Cloud\GkeConnect\Gateway\V1beta1\Client\GatewayServiceClient')) {
    echo "ERROR: GatewayServiceClient V1beta1 still exists!\n";
    exit(1);
} else {
    echo "SUCCESS: GatewayServiceClient V1beta1 does not exist.\n";
}

Output:

Testing client existence...
SUCCESS: GatewayServiceClient V1beta1 does not exist.

BREAKING_CHANGE_REASON=When GatewayServiceClient in V1beta1 was deprecated and removed from google-cloud-php in PR #7943, OwlBot successfully deleted the core class files but failed to clean up the associated samples/V1beta1/GatewayServiceClient directory. Librarian's strict generation correctly removes these orphaned artifacts. There is no impact to the core client functionality.

For googleapis/librarian#7366

[snippet-bot]

Here is the summary of changes.

You are about to delete 5 region tags.

• GkeConnectGateway/samples/V1beta1/GatewayServiceClient/delete_resource.php:25, tag connectgateway_v1beta1_generated_GatewayService_DeleteResource_sync
• GkeConnectGateway/samples/V1beta1/GatewayServiceClient/get_resource.php:25, tag connectgateway_v1beta1_generated_GatewayService_GetResource_sync
• GkeConnectGateway/samples/V1beta1/GatewayServiceClient/patch_resource.php:25, tag connectgateway_v1beta1_generated_GatewayService_PatchResource_sync
• GkeConnectGateway/samples/V1beta1/GatewayServiceClient/post_resource.php:25, tag connectgateway_v1beta1_generated_GatewayService_PostResource_sync
• GkeConnectGateway/samples/V1beta1/GatewayServiceClient/put_resource.php:25, tag connectgateway_v1beta1_generated_GatewayService_PutResource_sync

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