ci: fix e2e test by prebuilding agents #5917

Job	Run time
build-and-check	3m 1s
test-integration-packages/internal	1m 16s
test-integration-packages/agent-runtime	48s
test-integration-packages/billing	57s
test-integration-sdk	1m 22s
test-integration-cli	49s
test-integration-web	43s
test-integration-common	50s
test-cli	56s
test-sdk	43s
test-packages/internal	51s
test-web	43s
test-packages/agent-runtime	43s
test-.agents	41s
test-packages/billing	46s
test-common	36s
	15m 45s

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