[hotfix] Use `FlinkEnv` in tests for ForStStateBackend #284

Job	Run time
Pre-compile Checks / Basic QA	5m 55s
Default (Java 11) / Compile	22m 57s
Default (Java 11) / Test packaging/licensing	38m 37s
Default (Java 11) / Test (module: core)	28m 35s
Default (Java 11) / E2E (group 1)	1h 50m 9s
Default (Java 11) / Test (module: python)	29m 32s
Default (Java 11) / E2E (group 2)	2h 8m 55s
Default (Java 11) / Test (module: table)	35m 44s
Default (Java 11) / Test (module: connect)	22m 3s
Default (Java 11) / Test (module: tests)	37m 0s
Default (Java 11) / Test (module: misc)	27m 58s
	8h 7m 25s

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