refactor: migrate billing and test files to dependency injection pattern #5376

Job	Run time
build-and-check	2m 40s
test-web	57s
test-packages/agent-runtime	1m 0s
test-packages/billing	39s
test-sdk	44s
test-common	39s
test-.agents	38s
test-cli	1m 10s
test-integration-packages/agent-runtime	1m 0s
test-packages/internal	45s
test-integration-packages/internal	42s
test-integration-cli	47s
test-integration-.agents	44s
test-integration-common	40s
test-integration-packages/billing	47s
test-integration-sdk	46s
test-integration-web	40s
	15m 18s

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