* Remove pre-3.6 server versions from Evergreen matrix
* Remove skipped tests for pre-3.6 servers
* Remove old mongo-orchestration configs and Evergreen tasks
* Remove flaky replica set tests
These tests assume a particular replica set member is always the primary, so tag assertions may fail if a different member is elected. The server-getTags-002.phpt test has more flexible assertions for replica set tags, so we can safely remove these tests.
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