Downscale test runner size, increase shards #30926

Job	Run time
build-docker-image	2m 54s
feature-tests-python / test	3m 1s
feature-tests-java / test	2m 38s
feature-tests-ts / test	3m 3s
feature-tests-go-chasm-scheduler / test	3m 17s
feature-tests-dotnet / test	1m 56s
feature-tests-ruby / test	1m 15s
feature-tests-go / test	3m 0s
Tests Status	3s
	21m 7s

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