Add `batch` context object to microbatch jinja context #13269

Job	Run time
integration test metadata generation	1s
Test Log Schema (1)	5m 10s
Test Log Schema (2)	4m 20s
Test Log Schema (3)	4m 27s
Test Log Schema (4)	5m 15s
Test Log Schema (5)	5m 50s
Log Schema Test Suite	1s
	25m 4s

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