Apply 15s timeout to subscription limit tests (#521) #6156

Job	Run time
build-and-check	2m 57s
test-integration-packages/internal	1m 26s
test-integration-packages/billing	1m 2s
test-integration-packages/agent-runtime	39s
test-integration-web	43s
test-integration-common	44s
test-packages/internal	48s
test-integration-sdk	1m 21s
test-packages/billing	43s
test-cli	54s
test-integration-cli	43s
test-packages/agent-runtime	50s
test-sdk	52s
test-.agents	45s
test-web	56s
test-common	39s
	16m 2s

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