chore(Functions): remove obsolete files

[sofisl]

This PR removes obsolete structural files for Functions that are no longer generated.

Testing Deletions

I attempted to load the deleted classes to prove they do not exist anymore.

Test Script:

<?php
require 'vendor/autoload.php';
echo "Testing deleted classes for Functions...\n";
$success = true;
if (!$success) exit(1);

Output:

Testing deleted classes for Functions...

BREAKING_CHANGE_REASON=In google-cloud-php PR #7655, Functions was promoted to V2 and V1 was removed from the core library. OwlBot failed to delete the corresponding orphaned samples/V1 directory.

For googleapis/librarian#7366

[snippet-bot]

Here is the summary of changes.

You are about to delete 12 region tags.

• Functions/samples/V1/CloudFunctionsServiceClient/call_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_CallFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/create_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_CreateFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/delete_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_DeleteFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/generate_download_url.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GenerateDownloadUrl_sync
• Functions/samples/V1/CloudFunctionsServiceClient/generate_upload_url.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GenerateUploadUrl_sync
• Functions/samples/V1/CloudFunctionsServiceClient/get_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GetFunction_sync
• Functions/samples/V1/CloudFunctionsServiceClient/get_iam_policy.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_GetIamPolicy_sync
• Functions/samples/V1/CloudFunctionsServiceClient/list_functions.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_ListFunctions_sync
• Functions/samples/V1/CloudFunctionsServiceClient/list_locations.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_ListLocations_sync
• Functions/samples/V1/CloudFunctionsServiceClient/set_iam_policy.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_SetIamPolicy_sync
• Functions/samples/V1/CloudFunctionsServiceClient/test_iam_permissions.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_TestIamPermissions_sync
• Functions/samples/V1/CloudFunctionsServiceClient/update_function.php:25, tag cloudfunctions_v1_generated_CloudFunctionsService_UpdateFunction_sync

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