Only use amazon bedrock for our base2 opus, so there are fewer prompt… #5893

Job	Run time
build-and-check	3m 0s
test-integration-packages/internal	1m 15s
test-integration-packages/billing	1m 9s
test-integration-packages/agent-runtime	48s
test-integration-common	48s
test-integration-cli	43s
test-integration-sdk	1m 21s
test-integration-web	40s
test-.agents	43s
test-packages/agent-runtime	48s
test-web	56s
test-packages/billing	46s
test-common	37s
test-packages/internal	48s
test-sdk	51s
test-cli	47s
	16m 0s

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