Create simplify skill. Delete other unnecessary skills #6745

Job	Run time
build-and-check	2m 57s
test-integration-packages/billing	1m 2s
test-integration-packages/internal	1m 4s
test-integration-web	53s
test-integration-sdk	1m 32s
test-integration-cli	41s
test-integration-packages/agent-runtime	46s
test-common	40s
test-packages/billing	46s
test-sdk	51s
test-packages/agent-runtime	50s
test-cli	52s
test-.agents	42s
test-integration-common	41s
test-web	1m 1s
test-packages/internal	45s
	16m 3s

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