Add another context pruner test for good measure #5041

Job	Run time
build-and-check	2m 38s
test-backend	40s
test-.agents	38s
test-cli	1m 12s
test-common	40s
test-packages/agent-runtime	49s
test-packages/internal	41s
test-web	40s
test-packages/billing	35s
test-npm-app	52s
test-integration-sdk	55s
test-integration-common	46s
test-integration-web	45s
test-integration-backend	41s
test-integration-cli	38s
test-integration-packages/internal	41s
test-integration-npm-app	47s
test-integration-packages/agent-runtime	46s
test-integration-.agents	1m 10s
test-integration-packages/billing	40s
test-sdk	49s
	18m 3s

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