Add CHECK_FOR_INTERRUPTS in Evict{Rel,All}UnpinnedBuffers.

Add CHECK_FOR_INTERRUPTS in Evict{Rel,All}UnpinnedBuffers.

This commit adds CHECK_FOR_INTERRUPTS to the shared buffer iteration
loops in EvictRelUnpinnedBuffers and EvictAllUnpinnedBuffers. These
functions, used by pg_buffercache's pg_buffercache_evict_relation and
pg_buffercache_evict_all, can now be interrupted during long-running
operations.

Backpatch to version 18, where these functions and their corresponding
pg_buffercache functions were introduced.

Author: Yuhang Qiu <[email protected]>
Discussion: https://postgr.es/m/8DC280D4-94A2-4E7B-BAB9-C345891D0B78%40gmail.com
Backpatch-through: 18