Import wiredtiger: 9c79fedf125e1d63250d767a8bddffcfa9fb7757 from branch mongodb-4.4

ref: 8092bf0a39..9c79fedf12
for: 4.4.1

WT-5571       Evergreen loses compiler warnings, need way to add to CFLAGS
WT-5717       Reenable history store salvage test
WT-5945       Enable stricter performance for test_wt2853_perf
WT-5970       Update test_wt4333_handle_locks to use 1GB cache size
WT-6215       Clear backup block information on rename
WT-6233       Add statistic to track the number of times we remove keys from the history store due to inserting 0 timestamped entries
WT-6274       SESSIONs shouldn't nest calls to get/release hs cursor
WT-6325       Fast truncate can lead to never resolved prepared operations
WT-6331       Set oldest timestamp on startup of WiredTiger
WT-6421       Avoid parsing metadata checkpoint for clean files
WT-6425       Turn off log archiving to avoid file copy race
WT-6440       Use onpage visibility check helpers in __wt_txn_update_check
WT-6466       Don't reset the WT_SESSION timers when HS cursors are closed
WT-6468       Discard a deleted page that is cleaned by a checkpoint
WT-6473       format configuration with tiny caches can result in empty objects
WT-6474       Configure the global RNG before doing any command-line or configuration file processing
WT-6479       Don't insert updates after the first globally visible update to the history store
WT-6488       Fail update restore eviction if no new updates were written
WT-6491       No need to append the onpage value if it is prepared
WT-6492       Use WT_UPDATE_RESTORED_FROM_DS to determine if the onpage value is on the update chain or not
WT-6493       Retry processing update list if a prepared update is modified concurrently
WT-6499       Ignore evict priority for btrees that are dominating cache usage
WT-6508       Perform checkpoint cleanup on data store as part of checkpoint
WT-6511       cursor join: explicitly advance the iterator when finished with a clause
WT-6514       Fix description of eviction_updates_trigger in the documentation
WT-6517       Update test_txn13 to avoid getting a rollback error
WT-6519       Add testing coverage for mongodb-4.6 branch in compatibility test
WT-6521       Don't perform checkpoint cleanup during server startup and shutdown phase
WT-6527       When a thread cannot be allocated, return cleanly from WT API
WT-6528       Remove offensive terminology in WiredTiger API and source code
WT-6529       Use helper function in __rollback_abort_row_ondisk_kv
WT-6533       No need to do obsolete check before inserting to history store
WT-6539       Fix backup and rename memory leak
WT-6543       Distinguish Evergreen artifacts links across restarts for testing tasks
WT-6551       Avoid a timing problem at the beginning of a test for log preallocation
WT-6552       Fix configure flags in evergreen.yml for failing PPC tests

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