refactor: migrate find-files handler to agent-runtime package #3949

Job	Run time
build-and-check	2m 35s
test-common	29s
test-npm-app	35s
test-.agents	36s
test-integration-npm-app	30s
test-packages/agent-runtime	37s
test-web	36s
test-backend	38s
test-integration-.agents	36s
test-integration-backend	36s
test-cli	32s
test-integration-packages/agent-runtime	33s
test-integration-web	31s
test-integration-common	28s
test-integration-cli	35s
	10m 27s

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