Add dedicated load-skills test coverage #6082

Job	Run time
build-and-check	3m 2s
test-integration-packages/billing	1m 11s
test-integration-packages/internal	1m 2s
test-integration-packages/agent-runtime	51s
test-integration-cli	50s
test-integration-sdk	1m 23s
test-integration-common	1m 3s
test-common	44s
test-integration-web	40s
test-cli	55s
test-packages/agent-runtime	48s
test-packages/internal	57s
test-.agents	50s
test-packages/billing	52s
test-web	45s
test-sdk	42s
	16m 35s

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