Refactor and simplify ads client. Add more logging #5319

Job	Run time
build-and-check	2m 53s
test-integration-packages/agent-runtime	38s
test-integration-packages/internal	45s
test-integration-.agents	46s
test-integration-cli	37s
test-integration-packages/billing	41s
test-packages/agent-runtime	56s
test-integration-web	47s
test-integration-common	37s
test-integration-sdk	47s
test-cli	1m 6s
test-packages/billing	37s
test-common	43s
test-sdk	54s
test-web	50s
test-.agents	36s
test-packages/internal	49s
	15m 2s

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