reorganize/delete some base2 variants #4038

Job	Run time
build-and-check	2m 41s
test-npm-app	42s
test-backend	43s
test-integration-backend	43s
test-cli	38s
test-.agents	40s
test-web	36s
test-integration-.agents	44s
test-packages/agent-runtime	47s
test-common	45s
test-integration-packages/agent-runtime	44s
test-integration-common	36s
test-integration-npm-app	39s
test-integration-web	39s
test-integration-cli	38s
	12m 15s

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