refactor: migrate billing and test files to dependency injection pattern #5379

Job	Run time
build-and-check	2m 43s
test-web	43s
test-packages/internal	48s
test-packages/agent-runtime	1m 28s
test-integration-common	39s
test-common	40s
test-.agents	52s
test-integration-.agents	45s
test-integration-cli	41s
test-integration-web	36s
test-integration-packages/agent-runtime	40s
test-cli	1m 11s
test-integration-packages/billing	46s
test-packages/billing	42s
test-integration-packages/internal	40s
test-integration-sdk	40s
test-sdk	48s
	15m 22s

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