Add dedicated load-skills test coverage #6083

Job	Run time
build-and-check	3m 5s
test-integration-packages/internal	1m 8s
test-integration-packages/billing	1m 0s
test-integration-packages/agent-runtime	45s
test-integration-sdk	1m 24s
test-integration-web	43s
test-integration-common	49s
test-integration-cli	44s
test-packages/billing	48s
test-packages/agent-runtime	47s
test-cli	54s
test-web	51s
test-.agents	52s
test-sdk	46s
test-packages/internal	50s
test-common	46s
	16m 12s

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