Fix: explicitly invoke mcpdoc in e2e tests #940

Job	Run time
typescript / Check Typescript chatbot	34s
typescript / Check Typescript library	42s
python / Check Python library	44s
python / Check Python E2E tests	13s
python / Check Python chatbot	12s
cdk / Check Python-based Book Search Server	2m 15s
cdk / Check Typescript-based Weather Alerts Server	1m 40s
cdk / Check Typescript-based Dictionary Server	1m 45s
cdk / Check Python-based Time Server	1m 52s
cdk / Check Typescript-based Cat Facts Server	1m 38s
cdk / Check Python-based Dad Jokes Server	1m 53s
typescript / Check Typescript E2E tests	31s
cdk / Check Python-based MCP Doc Server	1m 53s
cdk / Check Python-based Inspiration Server	36s
cdk / Check Typescript-based Cognito stack	23s
cdk / Check Typescript-based Dog Facts Server	1m 32s
	18m 23s

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