fix: [Scheduler] remove obsolete V1beta1 samples

[sofisl]

For googleapis/librarian#7366

The V1beta1 surface for Scheduler was deleted in PR #7655 (chore!: create V2 release candidates for some components), but the samples were left behind as orphaned files.

This PR deletes the obsolete samples for V1beta1 to prevent confusion and errors. We can verify that the corresponding client class Google\Cloud\Scheduler\V1beta1\CloudSchedulerClient no longer exists in main:

<?php
require_once __DIR__ . '/vendor/autoload.php';

try {
    $client = new \Google\Cloud\Scheduler\V1beta1\CloudSchedulerClient();
} catch (\Error $e) {
    echo $e->getMessage() . "\n";
}

Class "Google\Cloud\Scheduler\V1beta1\CloudSchedulerClient" not found

BREAKING_CHANGE_REASON=Removing obsolete samples for deleted surface V1beta1.

[snippet-bot]

Here is the summary of changes.

You are about to delete 10 region tags.

• Scheduler/samples/V1beta1/CloudSchedulerClient/create_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_CreateJob_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/delete_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_DeleteJob_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/get_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_GetJob_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/get_location.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_GetLocation_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/list_jobs.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_ListJobs_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/list_locations.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_ListLocations_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/pause_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_PauseJob_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/resume_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_ResumeJob_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/run_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_RunJob_sync
• Scheduler/samples/V1beta1/CloudSchedulerClient/update_job.php:25, tag cloudscheduler_v1beta1_generated_CloudScheduler_UpdateJob_sync

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