Remove redundant code in tutorials #1100

Job	Run time
agilerl-tutorial-test (3.9, AgileRL)	15m 19s
agilerl-tutorial-test (3.10, AgileRL)	17m 15s
tutorial-test (3.8, Tianshou)	3m 23s
agilerl-tutorial-test (3.11, AgileRL)	16m 51s
tutorial-test (3.8, CustomEnvironment)	35s
tutorial-test (3.8, CleanRL)	5m 27s
tutorial-test (3.8, SB3/kaz)	9m 14s
tutorial-test (3.8, SB3/waterworld)	8m 33s
tutorial-test (3.8, SB3/connect_four)	2m 55s
tutorial-test (3.8, SB3/test)	2m 10s
tutorial-test (3.9, Tianshou)	1m 58s
tutorial-test (3.9, CustomEnvironment)	35s
tutorial-test (3.9, CleanRL)	5m 25s
tutorial-test (3.9, SB3/kaz)	7m 55s
tutorial-test (3.9, SB3/waterworld)	10m 1s
tutorial-test (3.9, SB3/connect_four)	3m 53s
tutorial-test (3.9, SB3/test)	2m 22s
tutorial-test (3.10, Tianshou)	2m 2s
tutorial-test (3.10, CustomEnvironment)	41s
tutorial-test (3.10, CleanRL)	7m 33s
tutorial-test (3.10, SB3/kaz)	4m 55s
tutorial-test (3.10, SB3/waterworld)	8m 15s
tutorial-test (3.10, SB3/connect_four)	2m 59s
tutorial-test (3.10, SB3/test)	2m 19s
tutorial-test (3.11, Tianshou)	2m 11s
tutorial-test (3.11, CustomEnvironment)	32s
tutorial-test (3.11, CleanRL)	7m 3s
tutorial-test (3.11, SB3/kaz)	5m 6s
tutorial-test (3.11, SB3/waterworld)	7m 50s
tutorial-test (3.11, SB3/connect_four)	2m 35s
tutorial-test (3.11, SB3/test)	2m 9s
	2h 50m 1s

Provide feedback