MB-50642: Add preserveExpiry as a bucket capability

Change-Id: I50c57f5c93aab678f04957619d14f1b035367ad9
Reviewed-on: https://review.couchbase.org/c/ns_server/+/172497
Tested-by: Navdeep S Boparai <[email protected]>
Well-Formed: Build Bot <[email protected]>
Reviewed-by: Steve Watanabe <[email protected]>

Author: boparai11

src/bucket_info_cache.erl

@@ -283,7 +283,9 @@ build_bucket_capabilities(BucketConfig) ->
                      {'subdoc.DocumentMacroSupport',
                       cluster_compat_mode:is_cluster_70()},
                      {'subdoc.ReviveDocument',
-                      cluster_compat_mode:is_cluster_71()}],
+                      cluster_compat_mode:is_cluster_71()},
+                     {preserveExpiry,
+                      cluster_compat_mode:is_cluster_MORPHEUS()}],
 
                 [C || {C, true} <- Conditional] ++
                     [dcp, cbhello, touch, cccp, xdcrCheckpointing, nodesExt,