Remove pubsublite library when service is turned down #15652
Description
pubsublite is deprecated, not accepting new users, and will be turned down on 2026/3/18 (https://cloud.google.com/pubsub/lite/docs)
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pubsublite is deprecated, not accepting new users, and will be turned down on 2026/3/18 (https://cloud.google.com/pubsub/lite/docs)