[12.x] Fix FIFO queue name normalization in Cloud managed queues

[kieranbrown]

Foundation\Cloud\Queue::normalizeQueue() stripped the environment suffix with chopEnd($suffix), but for FIFO queues the suffix sits before the .fifo terminal (e.g. orders-{uuid}.fifo), so the chop was a no-op and Cloud queue events reported orders-{uuid}.fifo instead of orders.fifo — leaking the per-environment UUID and breaking per-queue grouping/metrics.

This makes normalizeQueue() FIFO-aware, mirroring SqsQueue::suffixQueue() in reverse. Standard queues are unaffected. Added a regression test.

Backport of #60315.

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