feat: Add the AppsEventSubscriptions beta component

[Hectorhammett]

PiperOrigin-RevId: 743214430

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• AppsEventsSubscriptions/samples/V1beta/SubscriptionsServiceClient/create_subscription.php:25, tag workspaceevents_v1beta_generated_SubscriptionsService_CreateSubscription_sync
• AppsEventsSubscriptions/samples/V1beta/SubscriptionsServiceClient/delete_subscription.php:25, tag workspaceevents_v1beta_generated_SubscriptionsService_DeleteSubscription_sync
• AppsEventsSubscriptions/samples/V1beta/SubscriptionsServiceClient/get_subscription.php:25, tag workspaceevents_v1beta_generated_SubscriptionsService_GetSubscription_sync
• AppsEventsSubscriptions/samples/V1beta/SubscriptionsServiceClient/list_subscriptions.php:25, tag workspaceevents_v1beta_generated_SubscriptionsService_ListSubscriptions_sync
• AppsEventsSubscriptions/samples/V1beta/SubscriptionsServiceClient/reactivate_subscription.php:25, tag workspaceevents_v1beta_generated_SubscriptionsService_ReactivateSubscription_sync
• AppsEventsSubscriptions/samples/V1beta/SubscriptionsServiceClient/update_subscription.php:25, tag workspaceevents_v1beta_generated_SubscriptionsService_UpdateSubscription_sync

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