Add OpenCode runner to BuffBench (#615) #6491

Job	Run time
build-and-check	3m 8s
test-integration-packages/billing	59s
test-integration-cli	47s
test-integration-common	46s
test-integration-packages/internal	1m 6s
test-integration-sdk	1m 25s
test-cli	1m 3s
test-common	45s
test-integration-packages/agent-runtime	39s
test-sdk	43s
test-.agents	38s
test-packages/internal	52s
test-integration-web	46s
test-packages/agent-runtime	51s
test-packages/billing	39s
test-web	2m 25s
	17m 32s

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