Added connection panic flag in two assert statements in wt_evict_thread_run and _wt_evict_thread_stop.

unit-test-zstd failed on ! Ubuntu 18.04

Host: ec2-3-227-18-71.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-8023 Use global transaction information to asses if a session has active transaction (#6953)

• Inspect shared transaction data rather than private session->txn data structure to gather information about running transaction

• Use a write lock instead of read lock for processing global transaction structure | 01 Sep 21 05:30 UTC
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