Add dedicated load-skills test coverage (#502) #6084

Job	Run time
build-and-check	3m 13s
test-integration-packages/billing	1m 12s
test-integration-packages/internal	1m 7s
test-integration-common	47s
test-integration-packages/agent-runtime	53s
test-integration-cli	1m 1s
test-packages/agent-runtime	49s
test-.agents	42s
test-packages/billing	47s
test-web	53s
test-packages/internal	54s
test-common	42s
test-cli	1m 1s
test-sdk	47s
test-integration-sdk	1m 24s
test-integration-web	46s
	16m 58s

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