Insert one key per transaction to make test_txn24 pass on macOS

unit-test failed on OS X 10.12

Host: macos-1012-67.macstadium.build.10gen.cc
Project: WiredTiger (develop)
Commit: diff: WT-6624 Use transaction snapshot for applications performing eviction (#5987)

• Don't evict pages with updates from application txn

• Narrow down the criteria for updating application's snapshot

• handle special case for app thread evicting updates from running txn

• cover more corner cases

• ./s_all

• don't use snapshot for application threads in eviction when there is no txnid

• Fix a condition to detect updates from current txn

• Added the required WT ticket with the TODO

• Don't update snapshot for application threads in eviction

• Increase the cyclomatic complexity | 13 Oct 20 23:50 UTC
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