Remove last_open_read memory cache feature
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Cache
Cleanup
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Description
@zwoop pointed out the `last_open_read` cache feature is actually meaning less in 2026 at #13061. Do we want remove it by ATS 11.0.0? IMO, this is one of features makes Stripe complicated, so if possible, I'd remove it.
https://github.com/apache/trafficserver/pull/13061#issuecomment-4254120331
https://github.com/apache/trafficserver/blob/395bbafae5758f6e09e413495de286568cd76469/src/iocore/cache/CacheVC.cc#L476-L484
https://github.com/apache/trafficserver/blob/395bbafae5758f6e09e413495de286568cd76469/src/iocore/cache/CacheVC.cc#L532-L542
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