Build e2e tests

[cherrypick][PLUGIN-1779] Add TRANSACTION_ISOLATION_LEVEL config in MySQL, PostgreSQL & SQL Server plugins to support 6.9.x release #1441

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Run time

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Job	Run time
build (mysql-plugin)	11m 5s
build (postgresql-plugin)	7m 5s
build (oracle-plugin)	1h 53m 14s
build (mssql-plugin)	1m 43s
	2h 13m 7s