Add compact timing stress to the test_wt8246_compact_rts_data_correctness test

make-check-test failed on OS X 10.14

Host: macos-1014-161.macstadium.build.10gen.cc
Project: WiredTiger (develop)
Commit: diff: WT-8091 Create cpp test performing unique indexes insertions (#7182)

This ticket involves creating a prefix search near test in cppsuite. The idea behind this test is to make sure that MongoDB's method of unique index insertions doesn't have any problem. I have also added a default and stress config for this test. | 22 Nov 21 22:07 UTC
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