Revert "refactor(agents): deduplicate code and add documentation" #5633

Job	Run time
build-and-check	2m 39s
test-integration-packages/internal	1m 1s
test-integration-packages/billing	1m 11s
test-integration-common	41s
test-integration-packages/agent-runtime	40s
test-integration-cli	37s
test-integration-web	41s
test-packages/billing	45s
test-packages/agent-runtime	1m 8s
test-.agents	38s
test-packages/internal	53s
test-integration-sdk	41s
test-web	45s
test-sdk	49s
test-cli	50s
test-common	38s
	14m 37s

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