Remove evalbuff and expensivebuff (#492) #6037

Job	Run time
build-and-check	2m 57s
test-integration-packages/billing	1m 2s
test-integration-packages/internal	1m 5s
test-integration-cli	51s
test-integration-sdk	1m 50s
test-integration-common	41s
test-integration-web	43s
test-sdk	47s
test-packages/internal	48s
test-.agents	46s
test-integration-packages/agent-runtime	45s
test-packages/agent-runtime	57s
test-web	48s
test-packages/billing	50s
test-common	49s
test-cli	1m 2s
	16m 41s

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