fix(ci): split billing integration tests into dedicated job with post… #5493

Job	Run time
build-and-check	2m 21s
test-integration-packages/billing	1m 30s
test-integration-packages/agent-runtime	38s
test-integration-sdk	46s
test-integration-cli	39s
test-integration-packages/internal	41s
test-integration-common	40s
test-integration-web	51s
test-packages/internal	53s
test-packages/billing	41s
test-cli	1m 14s
test-web	49s
test-common	38s
test-packages/agent-runtime	1m 3s
test-sdk	53s
test-.agents	37s
	14m 54s

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