Remove evalbuff and expensivebuff (#493) #6107

Job	Run time
build-and-check	3m 10s
test-integration-packages/billing	1m 10s
test-integration-packages/internal	1m 6s
test-integration-sdk	1m 19s
test-integration-cli	45s
test-integration-web	50s
test-integration-common	49s
test-integration-packages/agent-runtime	46s
test-common	43s
test-packages/agent-runtime	42s
test-packages/internal	46s
test-.agents	49s
test-packages/billing	47s
test-web	1m 40s
test-cli	1m 1s
test-sdk	47s
	17m 10s

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