PHPLIB-1392: Convert transaction tests and support schema 1.9 (#1226)

* Support createEntities test runner operation and clarify that other syntax from schema 1.9 has not been implemented

* Remove redundant logic for preventStaleDbVersionError() in Operation

UnifiedTestRunner::preventStaleDbVersionError() already handles this. The Operation code was likely always redundant and dates back to the original test runner implementation in 4608a73.

* Preserve skip logic for ported legacy transaction tests

* Update path for relocated skipped test

See: #1228

Also updates a reference to a moved JIRA issue

* Remove legacy transaction spec tests

* Sync transactions and transactions-convenient-api spec tests

Synced with mongodb/specifications@e51a7bc

* Remove legacy transaction-convenient-api spec tests

* PHPLIB-1397: Update tests for skipping LB topologies for targetedFailPoint