chore(GkeHub): remove obsolete FeatureSpec and orphaned samples

[sofisl]

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

Testing Deletions

I verified that the erroneously placed FeatureSpec class is no longer present, but the correctly placed FeatureSpec classes in sub-namespaces still exist.

Test Script:

<?php
require 'vendor/autoload.php';
echo "Testing deleted classes...\n";
if (class_exists('Google\Cloud\GkeHub\V1\FeatureSpec')) {
    echo "ERROR: Google\Cloud\GkeHub\V1\FeatureSpec still exists!\n";
    exit(1);
} else {
    echo "SUCCESS: Google\Cloud\GkeHub\V1\FeatureSpec does not exist.\n";
}
if (class_exists('Google\Cloud\GkeHub\MultiClusterIngress\V1\FeatureSpec')) {
    echo "SUCCESS: Google\Cloud\GkeHub\MultiClusterIngress\V1\FeatureSpec correctly exists.\n";
} else {
    echo "ERROR: Google\Cloud\GkeHub\MultiClusterIngress\V1\FeatureSpec is missing!\n";
    exit(1);
}

Output:

Testing deleted classes...
SUCCESS: Google\Cloud\GkeHub\V1\FeatureSpec does not exist.
SUCCESS: Google\Cloud\GkeHub\MultiClusterIngress\V1\FeatureSpec correctly exists.

BREAKING_CHANGE_REASON=gapic-generator-php historically had a bug where it generated duplicate/orphaned messages in the root V1 namespace if they had sub-namespaces (like Google\Cloud\GkeHub\MultiClusterIngress\V1). When googleapis commit aa4559a97f was synced in PR #6254, OwlBot failed to clean up this GkeHub/src/V1/FeatureSpec.php file and left it orphaned. It also left behind orphaned sample files for V1beta1. Librarian correctly removes the duplicated file and the orphaned samples. This has no impact on users because the root FeatureSpec was never loadable via Composer PSR-4 anyway due to its namespace mismatch.

For googleapis/librarian#7366

[snippet-bot]

Here is the summary of changes.

You are about to delete 13 region tags.

• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/create_membership.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_CreateMembership_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/delete_membership.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_DeleteMembership_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/generate_connect_manifest.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_GenerateConnectManifest_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/generate_exclusivity_manifest.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_GenerateExclusivityManifest_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/get_iam_policy.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_GetIamPolicy_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/get_location.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_GetLocation_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/get_membership.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_GetMembership_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/list_locations.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_ListLocations_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/list_memberships.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_ListMemberships_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/set_iam_policy.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_SetIamPolicy_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/test_iam_permissions.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_TestIamPermissions_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/update_membership.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_UpdateMembership_sync
• GkeHub/samples/V1beta1/GkeHubMembershipServiceClient/validate_exclusivity.php:25, tag gkehub_v1beta1_generated_GkeHubMembershipService_ValidateExclusivity_sync

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